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Finding the Fourth Proportional to 417,920.40, 626,981.40 and 137,422.80

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Solution

The fourth proportional to 417,920.40, 626,981.40 and 137,422.80 is: 206,167.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    417,920.40 : 626,981.40 = 137,422.80 : x
  2. Step 2: Convert to fraction form
    417,920.40/626,981.40 = 137,422.80/x
  3. Step 3: Cross multiply
    417,920.40x = 626,981.40 × 137,422.80
  4. Step 4: Simplify right side
    417,920.40x = 86,161,539,535.92
  5. Step 5: Solve for x
    x = 86,161,539,535.92/417,920.40
  6. Step 6: Final answer
    x = 206,167.35

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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.