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Finding the Fourth Proportional to 153.92, 213.48 and 147.20

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Solution

The fourth proportional to 153.92, 213.48 and 147.20 is: 204.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.92 : 213.48 = 147.20 : x
  2. Step 2: Convert to fraction form
    153.92/213.48 = 147.20/x
  3. Step 3: Cross multiply
    153.92x = 213.48 × 147.20
  4. Step 4: Simplify right side
    153.92x = 31,424.26
  5. Step 5: Solve for x
    x = 31,424.26/153.92
  6. Step 6: Final answer
    x = 204.16

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.