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Finding the Fourth Proportional to 839.97, 1,259.97 and 474.74

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Solution

The fourth proportional to 839.97, 1,259.97 and 474.74 is: 712.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.97 : 1,259.97 = 474.74 : x
  2. Step 2: Convert to fraction form
    839.97/1,259.97 = 474.74/x
  3. Step 3: Cross multiply
    839.97x = 1,259.97 × 474.74
  4. Step 4: Simplify right side
    839.97x = 598,161.31
  5. Step 5: Solve for x
    x = 598,161.31/839.97
  6. Step 6: Final answer
    x = 712.12

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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.