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Finding the Fourth Proportional to 61.92, 91.76 and 61.65

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Solution

The fourth proportional to 61.92, 91.76 and 61.65 is: 91.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.92 : 91.76 = 61.65 : x
  2. Step 2: Convert to fraction form
    61.92/91.76 = 61.65/x
  3. Step 3: Cross multiply
    61.92x = 91.76 × 61.65
  4. Step 4: Simplify right side
    61.92x = 5,656.70
  5. Step 5: Solve for x
    x = 5,656.70/61.92
  6. Step 6: Final answer
    x = 91.35

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.