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Finding the Fourth Proportional to 386.88, 580.40 and 112.95

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Solution

The fourth proportional to 386.88, 580.40 and 112.95 is: 169.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.88 : 580.40 = 112.95 : x
  2. Step 2: Convert to fraction form
    386.88/580.40 = 112.95/x
  3. Step 3: Cross multiply
    386.88x = 580.40 × 112.95
  4. Step 4: Simplify right side
    386.88x = 65,555.70
  5. Step 5: Solve for x
    x = 65,555.70/386.88
  6. Step 6: Final answer
    x = 169.45

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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.