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Finding the Fourth Proportional to 91.21, 125.81 and 63.53

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Solution

The fourth proportional to 91.21, 125.81 and 63.53 is: 87.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.21 : 125.81 = 63.53 : x
  2. Step 2: Convert to fraction form
    91.21/125.81 = 63.53/x
  3. Step 3: Cross multiply
    91.21x = 125.81 × 63.53
  4. Step 4: Simplify right side
    91.21x = 7,992.24
  5. Step 5: Solve for x
    x = 7,992.24/91.21
  6. Step 6: Final answer
    x = 87.63

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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.