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Finding the Fourth Proportional to 839.49, 1,259.58 and 449.49

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Solution

The fourth proportional to 839.49, 1,259.58 and 449.49 is: 674.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.49 : 1,259.58 = 449.49 : x
  2. Step 2: Convert to fraction form
    839.49/1,259.58 = 449.49/x
  3. Step 3: Cross multiply
    839.49x = 1,259.58 × 449.49
  4. Step 4: Simplify right side
    839.49x = 566,168.61
  5. Step 5: Solve for x
    x = 566,168.61/839.49
  6. Step 6: Final answer
    x = 674.42

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Double scale
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1.5x scale

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.