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Finding the Fourth Proportional to 62.91, 86.64 and 49.07

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Solution

The fourth proportional to 62.91, 86.64 and 49.07 is: 67.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.91 : 86.64 = 49.07 : x
  2. Step 2: Convert to fraction form
    62.91/86.64 = 49.07/x
  3. Step 3: Cross multiply
    62.91x = 86.64 × 49.07
  4. Step 4: Simplify right side
    62.91x = 4,251.42
  5. Step 5: Solve for x
    x = 4,251.42/62.91
  6. Step 6: Final answer
    x = 67.58

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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.