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Finding the Fourth Proportional to 840.62, 1,259.91 and 449.66

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Solution

The fourth proportional to 840.62, 1,259.91 and 449.66 is: 673.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.62 : 1,259.91 = 449.66 : x
  2. Step 2: Convert to fraction form
    840.62/1,259.91 = 449.66/x
  3. Step 3: Cross multiply
    840.62x = 1,259.91 × 449.66
  4. Step 4: Simplify right side
    840.62x = 566,531.13
  5. Step 5: Solve for x
    x = 566,531.13/840.62
  6. Step 6: Final answer
    x = 673.94

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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.