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Finding the Fourth Proportional to 91.14, 137.40 and 88.31

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Solution

The fourth proportional to 91.14, 137.40 and 88.31 is: 133.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.14 : 137.40 = 88.31 : x
  2. Step 2: Convert to fraction form
    91.14/137.40 = 88.31/x
  3. Step 3: Cross multiply
    91.14x = 137.40 × 88.31
  4. Step 4: Simplify right side
    91.14x = 12,133.11
  5. Step 5: Solve for x
    x = 12,133.11/91.14
  6. Step 6: Final answer
    x = 133.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.