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Finding the Fourth Proportional to 1,240.81, 1,859.91 and 449.65

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Solution

The fourth proportional to 1,240.81, 1,859.91 and 449.65 is: 673.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.81 : 1,859.91 = 449.65 : x
  2. Step 2: Convert to fraction form
    1,240.81/1,859.91 = 449.65/x
  3. Step 3: Cross multiply
    1,240.81x = 1,859.91 × 449.65
  4. Step 4: Simplify right side
    1,240.81x = 836,297.55
  5. Step 5: Solve for x
    x = 836,297.55/1,240.81
  6. Step 6: Final answer
    x = 673.99

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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.