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Finding the Fourth Proportional to 154.88, 233.37 and 128.42

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Solution

The fourth proportional to 154.88, 233.37 and 128.42 is: 193.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.88 : 233.37 = 128.42 : x
  2. Step 2: Convert to fraction form
    154.88/233.37 = 128.42/x
  3. Step 3: Cross multiply
    154.88x = 233.37 × 128.42
  4. Step 4: Simplify right side
    154.88x = 29,969.38
  5. Step 5: Solve for x
    x = 29,969.38/154.88
  6. Step 6: Final answer
    x = 193.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.