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Finding the Fourth Proportional to 2,615.20, 3,922.80 and 971.17

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Solution

The fourth proportional to 2,615.20, 3,922.80 and 971.17 is: 1,456.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,615.20 : 3,922.80 = 971.17 : x
  2. Step 2: Convert to fraction form
    2,615.20/3,922.80 = 971.17/x
  3. Step 3: Cross multiply
    2,615.20x = 3,922.80 × 971.17
  4. Step 4: Simplify right side
    2,615.20x = 3,809,705.68
  5. Step 5: Solve for x
    x = 3,809,705.68/2,615.20
  6. Step 6: Final answer
    x = 1,456.76

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Similar ratio
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1.5x scale

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.