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Finding the Fourth Proportional to 1,240.05, 1,859.68 and 449.31

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Solution

The fourth proportional to 1,240.05, 1,859.68 and 449.31 is: 673.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.05 : 1,859.68 = 449.31 : x
  2. Step 2: Convert to fraction form
    1,240.05/1,859.68 = 449.31/x
  3. Step 3: Cross multiply
    1,240.05x = 1,859.68 × 449.31
  4. Step 4: Simplify right side
    1,240.05x = 835,572.82
  5. Step 5: Solve for x
    x = 835,572.82/1,240.05
  6. Step 6: Final answer
    x = 673.82

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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.