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Finding the Fourth Proportional to 62.79, 86.65 and 38.23

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Solution

The fourth proportional to 62.79, 86.65 and 38.23 is: 52.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.79 : 86.65 = 38.23 : x
  2. Step 2: Convert to fraction form
    62.79/86.65 = 38.23/x
  3. Step 3: Cross multiply
    62.79x = 86.65 × 38.23
  4. Step 4: Simplify right side
    62.79x = 3,312.86
  5. Step 5: Solve for x
    x = 3,312.86/62.79
  6. Step 6: Final answer
    x = 52.76

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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.