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Finding the Fourth Proportional to 62.75, 86.78 and 59.89

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Solution

The fourth proportional to 62.75, 86.78 and 59.89 is: 82.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.75 : 86.78 = 59.89 : x
  2. Step 2: Convert to fraction form
    62.75/86.78 = 59.89/x
  3. Step 3: Cross multiply
    62.75x = 86.78 × 59.89
  4. Step 4: Simplify right side
    62.75x = 5,196.52
  5. Step 5: Solve for x
    x = 5,196.52/62.75
  6. Step 6: Final answer
    x = 82.81

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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.