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Finding the Fourth Proportional to 118.40, 171.20 and 118.40

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Solution

The fourth proportional to 118.40, 171.20 and 118.40 is: 171.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 171.20 = 118.40 : x
  2. Step 2: Convert to fraction form
    118.40/171.20 = 118.40/x
  3. Step 3: Cross multiply
    118.40x = 171.20 × 118.40
  4. Step 4: Simplify right side
    118.40x = 20,270.08
  5. Step 5: Solve for x
    x = 20,270.08/118.40
  6. Step 6: Final answer
    x = 171.20

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.