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Finding the Fourth Proportional to 520,139.31, 717,731.17 and 290,696.68

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Solution

The fourth proportional to 520,139.31, 717,731.17 and 290,696.68 is: 401,127.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,139.31 : 717,731.17 = 290,696.68 : x
  2. Step 2: Convert to fraction form
    520,139.31/717,731.17 = 290,696.68/x
  3. Step 3: Cross multiply
    520,139.31x = 717,731.17 × 290,696.68
  4. Step 4: Simplify right side
    520,139.31x = 208,642,068,251.52
  5. Step 5: Solve for x
    x = 208,642,068,251.52/520,139.31
  6. Step 6: Final answer
    x = 401,127.28

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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.