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Finding the Fourth Proportional to 99.11, 147.63 and 90.60

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Solution

The fourth proportional to 99.11, 147.63 and 90.60 is: 134.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.11 : 147.63 = 90.60 : x
  2. Step 2: Convert to fraction form
    99.11/147.63 = 90.60/x
  3. Step 3: Cross multiply
    99.11x = 147.63 × 90.60
  4. Step 4: Simplify right side
    99.11x = 13,375.28
  5. Step 5: Solve for x
    x = 13,375.28/99.11
  6. Step 6: Final answer
    x = 134.96

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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.