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Finding the Fourth Proportional to 502,485.80, 753,728.70 and 289,909.40

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Solution

The fourth proportional to 502,485.80, 753,728.70 and 289,909.40 is: 434,864.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    502,485.80 : 753,728.70 = 289,909.40 : x
  2. Step 2: Convert to fraction form
    502,485.80/753,728.70 = 289,909.40/x
  3. Step 3: Cross multiply
    502,485.80x = 753,728.70 × 289,909.40
  4. Step 4: Simplify right side
    502,485.80x = 218,513,035,179.78
  5. Step 5: Solve for x
    x = 218,513,035,179.78/502,485.80
  6. Step 6: Final answer
    x = 434,864.10

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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.