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Finding the Fourth Proportional to 153.20, 229.52 and 128.98

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Solution

The fourth proportional to 153.20, 229.52 and 128.98 is: 193.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.20 : 229.52 = 128.98 : x
  2. Step 2: Convert to fraction form
    153.20/229.52 = 128.98/x
  3. Step 3: Cross multiply
    153.20x = 229.52 × 128.98
  4. Step 4: Simplify right side
    153.20x = 29,601.70
  5. Step 5: Solve for x
    x = 29,601.70/153.20
  6. Step 6: Final answer
    x = 193.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.