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Finding the Fourth Proportional to 643,457.70, 965,186.55 and 170,190.90

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Solution

The fourth proportional to 643,457.70, 965,186.55 and 170,190.90 is: 255,286.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,457.70 : 965,186.55 = 170,190.90 : x
  2. Step 2: Convert to fraction form
    643,457.70/965,186.55 = 170,190.90/x
  3. Step 3: Cross multiply
    643,457.70x = 965,186.55 × 170,190.90
  4. Step 4: Simplify right side
    643,457.70x = 164,265,967,612.40
  5. Step 5: Solve for x
    x = 164,265,967,612.40/643,457.70
  6. Step 6: Final answer
    x = 255,286.35

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.