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Finding the Fourth Proportional to 1,299.18, 1,949.98 and 641.80

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Solution

The fourth proportional to 1,299.18, 1,949.98 and 641.80 is: 963.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.18 : 1,949.98 = 641.80 : x
  2. Step 2: Convert to fraction form
    1,299.18/1,949.98 = 641.80/x
  3. Step 3: Cross multiply
    1,299.18x = 1,949.98 × 641.80
  4. Step 4: Simplify right side
    1,299.18x = 1,251,488.23
  5. Step 5: Solve for x
    x = 1,251,488.23/1,299.18
  6. Step 6: Final answer
    x = 963.29

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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.