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Finding the Fourth Proportional to 118.40, 163.42 and 74.15

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Solution

The fourth proportional to 118.40, 163.42 and 74.15 is: 102.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 163.42 = 74.15 : x
  2. Step 2: Convert to fraction form
    118.40/163.42 = 74.15/x
  3. Step 3: Cross multiply
    118.40x = 163.42 × 74.15
  4. Step 4: Simplify right side
    118.40x = 12,117.20
  5. Step 5: Solve for x
    x = 12,117.20/118.40
  6. Step 6: Final answer
    x = 102.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.