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Finding the Fourth Proportional to 609,210.18, 912,816.54 and 431,397.90

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Solution

The fourth proportional to 609,210.18, 912,816.54 and 431,397.90 is: 646,389.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    609,210.18 : 912,816.54 = 431,397.90 : x
  2. Step 2: Convert to fraction form
    609,210.18/912,816.54 = 431,397.90/x
  3. Step 3: Cross multiply
    609,210.18x = 912,816.54 × 431,397.90
  4. Step 4: Simplify right side
    609,210.18x = 393,787,138,441.27
  5. Step 5: Solve for x
    x = 393,787,138,441.27/609,210.18
  6. Step 6: Final answer
    x = 646,389.62

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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.