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Finding the Fourth Proportional to 804,991.90, 1,207,487.85 and 385,087.90

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Solution

The fourth proportional to 804,991.90, 1,207,487.85 and 385,087.90 is: 577,631.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    804,991.90 : 1,207,487.85 = 385,087.90 : x
  2. Step 2: Convert to fraction form
    804,991.90/1,207,487.85 = 385,087.90/x
  3. Step 3: Cross multiply
    804,991.90x = 1,207,487.85 × 385,087.90
  4. Step 4: Simplify right side
    804,991.90x = 464,988,960,432.02
  5. Step 5: Solve for x
    x = 464,988,960,432.02/804,991.90
  6. Step 6: Final answer
    x = 577,631.85

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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.