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Finding the Fourth Proportional to 90.08, 134.15 and 89.55

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Solution

The fourth proportional to 90.08, 134.15 and 89.55 is: 133.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.08 : 134.15 = 89.55 : x
  2. Step 2: Convert to fraction form
    90.08/134.15 = 89.55/x
  3. Step 3: Cross multiply
    90.08x = 134.15 × 89.55
  4. Step 4: Simplify right side
    90.08x = 12,012.68
  5. Step 5: Solve for x
    x = 12,012.68/90.08
  6. Step 6: Final answer
    x = 133.36

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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.