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Finding the Fourth Proportional to 91.54, 136.55 and 90.20

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Solution

The fourth proportional to 91.54, 136.55 and 90.20 is: 134.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.54 : 136.55 = 90.20 : x
  2. Step 2: Convert to fraction form
    91.54/136.55 = 90.20/x
  3. Step 3: Cross multiply
    91.54x = 136.55 × 90.20
  4. Step 4: Simplify right side
    91.54x = 12,316.81
  5. Step 5: Solve for x
    x = 12,316.81/91.54
  6. Step 6: Final answer
    x = 134.55

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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.