Home / 1,013.18-1,519.20-319.86

Finding the Fourth Proportional to 1,013.18, 1,519.20 and 319.86

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Solution

The fourth proportional to 1,013.18, 1,519.20 and 319.86 is: 479.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.18 : 1,519.20 = 319.86 : x
  2. Step 2: Convert to fraction form
    1,013.18/1,519.20 = 319.86/x
  3. Step 3: Cross multiply
    1,013.18x = 1,519.20 × 319.86
  4. Step 4: Simplify right side
    1,013.18x = 485,931.31
  5. Step 5: Solve for x
    x = 485,931.31/1,013.18
  6. Step 6: Final answer
    x = 479.61

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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.