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Finding the Fourth Proportional to 472,981.20, 709,471.80 and 389,000.40

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Solution

The fourth proportional to 472,981.20, 709,471.80 and 389,000.40 is: 583,500.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    472,981.20 : 709,471.80 = 389,000.40 : x
  2. Step 2: Convert to fraction form
    472,981.20/709,471.80 = 389,000.40/x
  3. Step 3: Cross multiply
    472,981.20x = 709,471.80 × 389,000.40
  4. Step 4: Simplify right side
    472,981.20x = 275,984,813,988.72
  5. Step 5: Solve for x
    x = 275,984,813,988.72/472,981.20
  6. Step 6: Final answer
    x = 583,500.60

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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.