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Finding the Fourth Proportional to 62.69, 86.42 and 51.76

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Solution

The fourth proportional to 62.69, 86.42 and 51.76 is: 71.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.69 : 86.42 = 51.76 : x
  2. Step 2: Convert to fraction form
    62.69/86.42 = 51.76/x
  3. Step 3: Cross multiply
    62.69x = 86.42 × 51.76
  4. Step 4: Simplify right side
    62.69x = 4,472.41
  5. Step 5: Solve for x
    x = 4,472.41/62.69
  6. Step 6: Final answer
    x = 71.34

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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.