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Finding the Fourth Proportional to 1,253.16, 1,879.73 and 387.47

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Solution

The fourth proportional to 1,253.16, 1,879.73 and 387.47 is: 581.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.16 : 1,879.73 = 387.47 : x
  2. Step 2: Convert to fraction form
    1,253.16/1,879.73 = 387.47/x
  3. Step 3: Cross multiply
    1,253.16x = 1,879.73 × 387.47
  4. Step 4: Simplify right side
    1,253.16x = 728,338.33
  5. Step 5: Solve for x
    x = 728,338.33/1,253.16
  6. Step 6: Final answer
    x = 581.20

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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.