Home / 1,213.20-1,818.90-519.30

Finding the Fourth Proportional to 1,213.20, 1,818.90 and 519.30

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Solution

The fourth proportional to 1,213.20, 1,818.90 and 519.30 is: 778.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.20 : 1,818.90 = 519.30 : x
  2. Step 2: Convert to fraction form
    1,213.20/1,818.90 = 519.30/x
  3. Step 3: Cross multiply
    1,213.20x = 1,818.90 × 519.30
  4. Step 4: Simplify right side
    1,213.20x = 944,554.77
  5. Step 5: Solve for x
    x = 944,554.77/1,213.20
  6. Step 6: Final answer
    x = 778.56

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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.