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Finding the Fourth Proportional to 1,252.66, 1,879.30 and 386.97

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Solution

The fourth proportional to 1,252.66, 1,879.30 and 386.97 is: 580.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.66 : 1,879.30 = 386.97 : x
  2. Step 2: Convert to fraction form
    1,252.66/1,879.30 = 386.97/x
  3. Step 3: Cross multiply
    1,252.66x = 1,879.30 × 386.97
  4. Step 4: Simplify right side
    1,252.66x = 727,230.79
  5. Step 5: Solve for x
    x = 727,230.79/1,252.66
  6. Step 6: Final answer
    x = 580.55

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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.