Home / 1,299.60-1,949.76-519.90

Finding the Fourth Proportional to 1,299.60, 1,949.76 and 519.90

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Solution

The fourth proportional to 1,299.60, 1,949.76 and 519.90 is: 779.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.60 : 1,949.76 = 519.90 : x
  2. Step 2: Convert to fraction form
    1,299.60/1,949.76 = 519.90/x
  3. Step 3: Cross multiply
    1,299.60x = 1,949.76 × 519.90
  4. Step 4: Simplify right side
    1,299.60x = 1,013,680.22
  5. Step 5: Solve for x
    x = 1,013,680.22/1,299.60
  6. Step 6: Final answer
    x = 779.99

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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.