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Finding the Fourth Proportional to 718,036.20, 990,891.36 and 391,352.88

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Solution

The fourth proportional to 718,036.20, 990,891.36 and 391,352.88 is: 540,067.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,036.20 : 990,891.36 = 391,352.88 : x
  2. Step 2: Convert to fraction form
    718,036.20/990,891.36 = 391,352.88/x
  3. Step 3: Cross multiply
    718,036.20x = 990,891.36 × 391,352.88
  4. Step 4: Simplify right side
    718,036.20x = 387,788,187,503.12
  5. Step 5: Solve for x
    x = 387,788,187,503.12/718,036.20
  6. Step 6: Final answer
    x = 540,067.74

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1.5x scale

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.