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Finding the Fourth Proportional to 62.75, 86.56 and 53.95

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Solution

The fourth proportional to 62.75, 86.56 and 53.95 is: 74.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.75 : 86.56 = 53.95 : x
  2. Step 2: Convert to fraction form
    62.75/86.56 = 53.95/x
  3. Step 3: Cross multiply
    62.75x = 86.56 × 53.95
  4. Step 4: Simplify right side
    62.75x = 4,669.64
  5. Step 5: Solve for x
    x = 4,669.64/62.75
  6. Step 6: Final answer
    x = 74.42

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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.