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Finding the Fourth Proportional to 52.91, 72.92 and 40.61

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Solution

The fourth proportional to 52.91, 72.92 and 40.61 is: 55.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.91 : 72.92 = 40.61 : x
  2. Step 2: Convert to fraction form
    52.91/72.92 = 40.61/x
  3. Step 3: Cross multiply
    52.91x = 72.92 × 40.61
  4. Step 4: Simplify right side
    52.91x = 2,960.71
  5. Step 5: Solve for x
    x = 2,960.71/52.91
  6. Step 6: Final answer
    x = 55.96

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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.