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Finding the Fourth Proportional to 92.76, 127.91 and 61.65

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Solution

The fourth proportional to 92.76, 127.91 and 61.65 is: 85.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.76 : 127.91 = 61.65 : x
  2. Step 2: Convert to fraction form
    92.76/127.91 = 61.65/x
  3. Step 3: Cross multiply
    92.76x = 127.91 × 61.65
  4. Step 4: Simplify right side
    92.76x = 7,885.81
  5. Step 5: Solve for x
    x = 7,885.81/92.76
  6. Step 6: Final answer
    x = 85.02

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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.