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Finding the Fourth Proportional to 1,616.19, 2,422.14 and 641.76

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Solution

The fourth proportional to 1,616.19, 2,422.14 and 641.76 is: 961.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,616.19 : 2,422.14 = 641.76 : x
  2. Step 2: Convert to fraction form
    1,616.19/2,422.14 = 641.76/x
  3. Step 3: Cross multiply
    1,616.19x = 2,422.14 × 641.76
  4. Step 4: Simplify right side
    1,616.19x = 1,554,432.57
  5. Step 5: Solve for x
    x = 1,554,432.57/1,616.19
  6. Step 6: Final answer
    x = 961.79

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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.