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Finding the Fourth Proportional to 2,702.80, 4,052.94 and 971.20

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Solution

The fourth proportional to 2,702.80, 4,052.94 and 971.20 is: 1,456.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,702.80 : 4,052.94 = 971.20 : x
  2. Step 2: Convert to fraction form
    2,702.80/4,052.94 = 971.20/x
  3. Step 3: Cross multiply
    2,702.80x = 4,052.94 × 971.20
  4. Step 4: Simplify right side
    2,702.80x = 3,936,215.33
  5. Step 5: Solve for x
    x = 3,936,215.33/2,702.80
  6. Step 6: Final answer
    x = 1,456.35

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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.