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Finding the Fourth Proportional to 825.84, 1,139.67 and 452.79

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Solution

The fourth proportional to 825.84, 1,139.67 and 452.79 is: 624.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.84 : 1,139.67 = 452.79 : x
  2. Step 2: Convert to fraction form
    825.84/1,139.67 = 452.79/x
  3. Step 3: Cross multiply
    825.84x = 1,139.67 × 452.79
  4. Step 4: Simplify right side
    825.84x = 516,031.18
  5. Step 5: Solve for x
    x = 516,031.18/825.84
  6. Step 6: Final answer
    x = 624.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.