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Finding the Fourth Proportional to 72.43, 99.91 and 42.92

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Solution

The fourth proportional to 72.43, 99.91 and 42.92 is: 59.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.43 : 99.91 = 42.92 : x
  2. Step 2: Convert to fraction form
    72.43/99.91 = 42.92/x
  3. Step 3: Cross multiply
    72.43x = 99.91 × 42.92
  4. Step 4: Simplify right side
    72.43x = 4,288.14
  5. Step 5: Solve for x
    x = 4,288.14/72.43
  6. Step 6: Final answer
    x = 59.20

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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.