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Finding the Fourth Proportional to 62.91, 86.85 and 45.47

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Solution

The fourth proportional to 62.91, 86.85 and 45.47 is: 62.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.91 : 86.85 = 45.47 : x
  2. Step 2: Convert to fraction form
    62.91/86.85 = 45.47/x
  3. Step 3: Cross multiply
    62.91x = 86.85 × 45.47
  4. Step 4: Simplify right side
    62.91x = 3,948.64
  5. Step 5: Solve for x
    x = 3,948.64/62.91
  6. Step 6: Final answer
    x = 62.77

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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.