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Finding the Fourth Proportional to 498,495.78, 687,920.67 and 272,141.28

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Solution

The fourth proportional to 498,495.78, 687,920.67 and 272,141.28 is: 375,553.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    498,495.78 : 687,920.67 = 272,141.28 : x
  2. Step 2: Convert to fraction form
    498,495.78/687,920.67 = 272,141.28/x
  3. Step 3: Cross multiply
    498,495.78x = 687,920.67 × 272,141.28
  4. Step 4: Simplify right side
    498,495.78x = 187,211,611,672.26
  5. Step 5: Solve for x
    x = 187,211,611,672.26/498,495.78
  6. Step 6: Final answer
    x = 375,553.05

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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.