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Finding the Fourth Proportional to 155.17, 231.76 and 124.80

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Solution

The fourth proportional to 155.17, 231.76 and 124.80 is: 186.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.17 : 231.76 = 124.80 : x
  2. Step 2: Convert to fraction form
    155.17/231.76 = 124.80/x
  3. Step 3: Cross multiply
    155.17x = 231.76 × 124.80
  4. Step 4: Simplify right side
    155.17x = 28,923.65
  5. Step 5: Solve for x
    x = 28,923.65/155.17
  6. Step 6: Final answer
    x = 186.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.