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Finding the Fourth Proportional to 155.10, 213.79 and 123.92

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Solution

The fourth proportional to 155.10, 213.79 and 123.92 is: 170.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.10 : 213.79 = 123.92 : x
  2. Step 2: Convert to fraction form
    155.10/213.79 = 123.92/x
  3. Step 3: Cross multiply
    155.10x = 213.79 × 123.92
  4. Step 4: Simplify right side
    155.10x = 26,491.17
  5. Step 5: Solve for x
    x = 26,491.17/155.10
  6. Step 6: Final answer
    x = 170.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.