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Finding the Fourth Proportional to 91.33, 136.37 and 86.26

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Solution

The fourth proportional to 91.33, 136.37 and 86.26 is: 128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.33 : 136.37 = 86.26 : x
  2. Step 2: Convert to fraction form
    91.33/136.37 = 86.26/x
  3. Step 3: Cross multiply
    91.33x = 136.37 × 86.26
  4. Step 4: Simplify right side
    91.33x = 11,763.28
  5. Step 5: Solve for x
    x = 11,763.28/91.33
  6. Step 6: Final answer
    x = 128.80

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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.