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Finding the Fourth Proportional to 91.56, 126.59 and 64.14

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Solution

The fourth proportional to 91.56, 126.59 and 64.14 is: 88.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.56 : 126.59 = 64.14 : x
  2. Step 2: Convert to fraction form
    91.56/126.59 = 64.14/x
  3. Step 3: Cross multiply
    91.56x = 126.59 × 64.14
  4. Step 4: Simplify right side
    91.56x = 8,119.48
  5. Step 5: Solve for x
    x = 8,119.48/91.56
  6. Step 6: Final answer
    x = 88.68

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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.