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Finding the Fourth Proportional to 90.32, 135.48 and 88.70

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Solution

The fourth proportional to 90.32, 135.48 and 88.70 is: 133.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.32 : 135.48 = 88.70 : x
  2. Step 2: Convert to fraction form
    90.32/135.48 = 88.70/x
  3. Step 3: Cross multiply
    90.32x = 135.48 × 88.70
  4. Step 4: Simplify right side
    90.32x = 12,017.08
  5. Step 5: Solve for x
    x = 12,017.08/90.32
  6. Step 6: Final answer
    x = 133.05

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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.