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Finding the Fourth Proportional to 318.97, 478.47 and 123.95

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Solution

The fourth proportional to 318.97, 478.47 and 123.95 is: 185.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.97 : 478.47 = 123.95 : x
  2. Step 2: Convert to fraction form
    318.97/478.47 = 123.95/x
  3. Step 3: Cross multiply
    318.97x = 478.47 × 123.95
  4. Step 4: Simplify right side
    318.97x = 59,305.33
  5. Step 5: Solve for x
    x = 59,305.33/318.97
  6. Step 6: Final answer
    x = 185.93

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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.