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Finding the Fourth Proportional to 839.59, 1,257.60 and 531.28

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Solution

The fourth proportional to 839.59, 1,257.60 and 531.28 is: 795.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.59 : 1,257.60 = 531.28 : x
  2. Step 2: Convert to fraction form
    839.59/1,257.60 = 531.28/x
  3. Step 3: Cross multiply
    839.59x = 1,257.60 × 531.28
  4. Step 4: Simplify right side
    839.59x = 668,137.73
  5. Step 5: Solve for x
    x = 668,137.73/839.59
  6. Step 6: Final answer
    x = 795.79

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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.