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Finding the Fourth Proportional to 90.66, 136 and 39.28

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Solution

The fourth proportional to 90.66, 136 and 39.28 is: 58.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.66 : 136 = 39.28 : x
  2. Step 2: Convert to fraction form
    90.66/136 = 39.28/x
  3. Step 3: Cross multiply
    90.66x = 136 × 39.28
  4. Step 4: Simplify right side
    90.66x = 5,342.08
  5. Step 5: Solve for x
    x = 5,342.08/90.66
  6. Step 6: Final answer
    x = 58.92

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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.