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Finding the Fourth Proportional to 91.45, 136.98 and 86.44

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Solution

The fourth proportional to 91.45, 136.98 and 86.44 is: 129.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.45 : 136.98 = 86.44 : x
  2. Step 2: Convert to fraction form
    91.45/136.98 = 86.44/x
  3. Step 3: Cross multiply
    91.45x = 136.98 × 86.44
  4. Step 4: Simplify right side
    91.45x = 11,840.55
  5. Step 5: Solve for x
    x = 11,840.55/91.45
  6. Step 6: Final answer
    x = 129.48

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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.