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Finding the Fourth Proportional to 153.09, 229.36 and 128.87

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Solution

The fourth proportional to 153.09, 229.36 and 128.87 is: 193.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.09 : 229.36 = 128.87 : x
  2. Step 2: Convert to fraction form
    153.09/229.36 = 128.87/x
  3. Step 3: Cross multiply
    153.09x = 229.36 × 128.87
  4. Step 4: Simplify right side
    153.09x = 29,557.62
  5. Step 5: Solve for x
    x = 29,557.62/153.09
  6. Step 6: Final answer
    x = 193.07

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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.