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Finding the Fourth Proportional to 155.07, 213.82 and 123.95

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Solution

The fourth proportional to 155.07, 213.82 and 123.95 is: 170.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.07 : 213.82 = 123.95 : x
  2. Step 2: Convert to fraction form
    155.07/213.82 = 123.95/x
  3. Step 3: Cross multiply
    155.07x = 213.82 × 123.95
  4. Step 4: Simplify right side
    155.07x = 26,502.99
  5. Step 5: Solve for x
    x = 26,502.99/155.07
  6. Step 6: Final answer
    x = 170.91

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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.