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Finding the Fourth Proportional to 91.36, 135.96 and 87.52

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Solution

The fourth proportional to 91.36, 135.96 and 87.52 is: 130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 135.96 = 87.52 : x
  2. Step 2: Convert to fraction form
    91.36/135.96 = 87.52/x
  3. Step 3: Cross multiply
    91.36x = 135.96 × 87.52
  4. Step 4: Simplify right side
    91.36x = 11,899.22
  5. Step 5: Solve for x
    x = 11,899.22/91.36
  6. Step 6: Final answer
    x = 130.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.