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Finding the Fourth Proportional to 90.95, 136.47 and 39.60

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Solution

The fourth proportional to 90.95, 136.47 and 39.60 is: 59.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.95 : 136.47 = 39.60 : x
  2. Step 2: Convert to fraction form
    90.95/136.47 = 39.60/x
  3. Step 3: Cross multiply
    90.95x = 136.47 × 39.60
  4. Step 4: Simplify right side
    90.95x = 5,403.91
  5. Step 5: Solve for x
    x = 5,403.91/90.95
  6. Step 6: Final answer
    x = 59.42

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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.