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Finding the Fourth Proportional to 1,615.76, 2,422.20 and 641.24

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Solution

The fourth proportional to 1,615.76, 2,422.20 and 641.24 is: 961.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.76 : 2,422.20 = 641.24 : x
  2. Step 2: Convert to fraction form
    1,615.76/2,422.20 = 641.24/x
  3. Step 3: Cross multiply
    1,615.76x = 2,422.20 × 641.24
  4. Step 4: Simplify right side
    1,615.76x = 1,553,211.53
  5. Step 5: Solve for x
    x = 1,553,211.53/1,615.76
  6. Step 6: Final answer
    x = 961.29

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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.