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Finding the Fourth Proportional to 1,260.86, 1,891.31 and 383.38

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Solution

The fourth proportional to 1,260.86, 1,891.31 and 383.38 is: 575.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.86 : 1,891.31 = 383.38 : x
  2. Step 2: Convert to fraction form
    1,260.86/1,891.31 = 383.38/x
  3. Step 3: Cross multiply
    1,260.86x = 1,891.31 × 383.38
  4. Step 4: Simplify right side
    1,260.86x = 725,083.78
  5. Step 5: Solve for x
    x = 725,083.78/1,260.86
  6. Step 6: Final answer
    x = 575.07

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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.