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Finding the Fourth Proportional to 155.88, 233.87 and 128.70

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Solution

The fourth proportional to 155.88, 233.87 and 128.70 is: 193.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.88 : 233.87 = 128.70 : x
  2. Step 2: Convert to fraction form
    155.88/233.87 = 128.70/x
  3. Step 3: Cross multiply
    155.88x = 233.87 × 128.70
  4. Step 4: Simplify right side
    155.88x = 30,098.43
  5. Step 5: Solve for x
    x = 30,098.43/155.88
  6. Step 6: Final answer
    x = 193.09

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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.