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Finding the Fourth Proportional to 718,476.50, 991,490.32 and 391,788.71

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Solution

The fourth proportional to 718,476.50, 991,490.32 and 391,788.71 is: 540,664.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,476.50 : 991,490.32 = 391,788.71 : x
  2. Step 2: Convert to fraction form
    718,476.50/991,490.32 = 391,788.71/x
  3. Step 3: Cross multiply
    718,476.50x = 991,490.32 × 391,788.71
  4. Step 4: Simplify right side
    718,476.50x = 388,454,713,450.29
  5. Step 5: Solve for x
    x = 388,454,713,450.29/718,476.50
  6. Step 6: Final answer
    x = 540,664.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.