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Finding the Fourth Proportional to 839.22, 1,259.43 and 474.72

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Solution

The fourth proportional to 839.22, 1,259.43 and 474.72 is: 712.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.22 : 1,259.43 = 474.72 : x
  2. Step 2: Convert to fraction form
    839.22/1,259.43 = 474.72/x
  3. Step 3: Cross multiply
    839.22x = 1,259.43 × 474.72
  4. Step 4: Simplify right side
    839.22x = 597,876.61
  5. Step 5: Solve for x
    x = 597,876.61/839.22
  6. Step 6: Final answer
    x = 712.42

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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.