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Finding the Fourth Proportional to 72,929.80, 100,390.26 and 62,891.56

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Solution

The fourth proportional to 72,929.80, 100,390.26 and 62,891.56 is: 86,572.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,929.80 : 100,390.26 = 62,891.56 : x
  2. Step 2: Convert to fraction form
    72,929.80/100,390.26 = 62,891.56/x
  3. Step 3: Cross multiply
    72,929.80x = 100,390.26 × 62,891.56
  4. Step 4: Simplify right side
    72,929.80x = 6,313,700,060.21
  5. Step 5: Solve for x
    x = 6,313,700,060.21/72,929.80
  6. Step 6: Final answer
    x = 86,572.29

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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.