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Finding the Fourth Proportional to 1,616.71, 2,422.79 and 641.67

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Solution

The fourth proportional to 1,616.71, 2,422.79 and 641.67 is: 961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,616.71 : 2,422.79 = 641.67 : x
  2. Step 2: Convert to fraction form
    1,616.71/2,422.79 = 641.67/x
  3. Step 3: Cross multiply
    1,616.71x = 2,422.79 × 641.67
  4. Step 4: Simplify right side
    1,616.71x = 1,554,633.60
  5. Step 5: Solve for x
    x = 1,554,633.60/1,616.71
  6. Step 6: Final answer
    x = 961.60

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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.