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Finding the Fourth Proportional to 153.50, 230.11 and 128.99

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Solution

The fourth proportional to 153.50, 230.11 and 128.99 is: 193.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.50 : 230.11 = 128.99 : x
  2. Step 2: Convert to fraction form
    153.50/230.11 = 128.99/x
  3. Step 3: Cross multiply
    153.50x = 230.11 × 128.99
  4. Step 4: Simplify right side
    153.50x = 29,682.14
  5. Step 5: Solve for x
    x = 29,682.14/153.50
  6. Step 6: Final answer
    x = 193.38

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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.