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Finding the Fourth Proportional to 91.36, 137.16 and 84.58

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Solution

The fourth proportional to 91.36, 137.16 and 84.58 is: 126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 137.16 = 84.58 : x
  2. Step 2: Convert to fraction form
    91.36/137.16 = 84.58/x
  3. Step 3: Cross multiply
    91.36x = 137.16 × 84.58
  4. Step 4: Simplify right side
    91.36x = 11,600.99
  5. Step 5: Solve for x
    x = 11,600.99/91.36
  6. Step 6: Final answer
    x = 126.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.