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Finding the Fourth Proportional to 839.82, 1,259.97 and 407.22

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Solution

The fourth proportional to 839.82, 1,259.97 and 407.22 is: 610.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.82 : 1,259.97 = 407.22 : x
  2. Step 2: Convert to fraction form
    839.82/1,259.97 = 407.22/x
  3. Step 3: Cross multiply
    839.82x = 1,259.97 × 407.22
  4. Step 4: Simplify right side
    839.82x = 513,084.98
  5. Step 5: Solve for x
    x = 513,084.98/839.82
  6. Step 6: Final answer
    x = 610.95

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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.