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Finding the Fourth Proportional to 155.85, 233.36 and 128.92

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Solution

The fourth proportional to 155.85, 233.36 and 128.92 is: 193.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.85 : 233.36 = 128.92 : x
  2. Step 2: Convert to fraction form
    155.85/233.36 = 128.92/x
  3. Step 3: Cross multiply
    155.85x = 233.36 × 128.92
  4. Step 4: Simplify right side
    155.85x = 30,084.77
  5. Step 5: Solve for x
    x = 30,084.77/155.85
  6. Step 6: Final answer
    x = 193.04

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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.