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Finding the Fourth Proportional to 702.39, 1,052.78 and 427.87

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Solution

The fourth proportional to 702.39, 1,052.78 and 427.87 is: 641.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.39 : 1,052.78 = 427.87 : x
  2. Step 2: Convert to fraction form
    702.39/1,052.78 = 427.87/x
  3. Step 3: Cross multiply
    702.39x = 1,052.78 × 427.87
  4. Step 4: Simplify right side
    702.39x = 450,454.56
  5. Step 5: Solve for x
    x = 450,454.56/702.39
  6. Step 6: Final answer
    x = 641.32

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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.