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Finding the Fourth Proportional to 90.60, 134.89 and 90.32

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Solution

The fourth proportional to 90.60, 134.89 and 90.32 is: 134.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.60 : 134.89 = 90.32 : x
  2. Step 2: Convert to fraction form
    90.60/134.89 = 90.32/x
  3. Step 3: Cross multiply
    90.60x = 134.89 × 90.32
  4. Step 4: Simplify right side
    90.60x = 12,183.26
  5. Step 5: Solve for x
    x = 12,183.26/90.60
  6. Step 6: Final answer
    x = 134.47

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Double scale
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Similar ratio
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1.5x scale

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.