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Finding the Fourth Proportional to 91.68, 126.48 and 65.76

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Solution

The fourth proportional to 91.68, 126.48 and 65.76 is: 90.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.68 : 126.48 = 65.76 : x
  2. Step 2: Convert to fraction form
    91.68/126.48 = 65.76/x
  3. Step 3: Cross multiply
    91.68x = 126.48 × 65.76
  4. Step 4: Simplify right side
    91.68x = 8,317.32
  5. Step 5: Solve for x
    x = 8,317.32/91.68
  6. Step 6: Final answer
    x = 90.72

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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.