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Finding the Fourth Proportional to 99.16, 147.68 and 93.90

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Solution

The fourth proportional to 99.16, 147.68 and 93.90 is: 139.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.16 : 147.68 = 93.90 : x
  2. Step 2: Convert to fraction form
    99.16/147.68 = 93.90/x
  3. Step 3: Cross multiply
    99.16x = 147.68 × 93.90
  4. Step 4: Simplify right side
    99.16x = 13,867.15
  5. Step 5: Solve for x
    x = 13,867.15/99.16
  6. Step 6: Final answer
    x = 139.85

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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.