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Finding the Fourth Proportional to 118.40, 163.56 and 106.16

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Solution

The fourth proportional to 118.40, 163.56 and 106.16 is: 146.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 163.56 = 106.16 : x
  2. Step 2: Convert to fraction form
    118.40/163.56 = 106.16/x
  3. Step 3: Cross multiply
    118.40x = 163.56 × 106.16
  4. Step 4: Simplify right side
    118.40x = 17,363.53
  5. Step 5: Solve for x
    x = 17,363.53/118.40
  6. Step 6: Final answer
    x = 146.65

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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.