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Finding the Fourth Proportional to 839,909.70, 1,259,864.55 and 540,728.10

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Solution

The fourth proportional to 839,909.70, 1,259,864.55 and 540,728.10 is: 811,092.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,909.70 : 1,259,864.55 = 540,728.10 : x
  2. Step 2: Convert to fraction form
    839,909.70/1,259,864.55 = 540,728.10/x
  3. Step 3: Cross multiply
    839,909.70x = 1,259,864.55 × 540,728.10
  4. Step 4: Simplify right side
    839,909.70x = 681,244,164,378.86
  5. Step 5: Solve for x
    x = 681,244,164,378.86/839,909.70
  6. Step 6: Final answer
    x = 811,092.15

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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.