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Finding the Fourth Proportional to 1,253.15, 1,879.76 and 387.47

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Solution

The fourth proportional to 1,253.15, 1,879.76 and 387.47 is: 581.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.15 : 1,879.76 = 387.47 : x
  2. Step 2: Convert to fraction form
    1,253.15/1,879.76 = 387.47/x
  3. Step 3: Cross multiply
    1,253.15x = 1,879.76 × 387.47
  4. Step 4: Simplify right side
    1,253.15x = 728,339.27
  5. Step 5: Solve for x
    x = 728,339.27/1,253.15
  6. Step 6: Final answer
    x = 581.21

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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.