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Finding the Fourth Proportional to 91.77, 126.63 and 64.13

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Solution

The fourth proportional to 91.77, 126.63 and 64.13 is: 88.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.77 : 126.63 = 64.13 : x
  2. Step 2: Convert to fraction form
    91.77/126.63 = 64.13/x
  3. Step 3: Cross multiply
    91.77x = 126.63 × 64.13
  4. Step 4: Simplify right side
    91.77x = 8,120.38
  5. Step 5: Solve for x
    x = 8,120.38/91.77
  6. Step 6: Final answer
    x = 88.49

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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.