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Finding the Fourth Proportional to 62.92, 86.87 and 53.81

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Solution

The fourth proportional to 62.92, 86.87 and 53.81 is: 74.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.92 : 86.87 = 53.81 : x
  2. Step 2: Convert to fraction form
    62.92/86.87 = 53.81/x
  3. Step 3: Cross multiply
    62.92x = 86.87 × 53.81
  4. Step 4: Simplify right side
    62.92x = 4,674.47
  5. Step 5: Solve for x
    x = 4,674.47/62.92
  6. Step 6: Final answer
    x = 74.29

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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.