Home / 1,012.10-1,518.39-318.85

Finding the Fourth Proportional to 1,012.10, 1,518.39 and 318.85

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Solution

The fourth proportional to 1,012.10, 1,518.39 and 318.85 is: 478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.10 : 1,518.39 = 318.85 : x
  2. Step 2: Convert to fraction form
    1,012.10/1,518.39 = 318.85/x
  3. Step 3: Cross multiply
    1,012.10x = 1,518.39 × 318.85
  4. Step 4: Simplify right side
    1,012.10x = 484,134.86
  5. Step 5: Solve for x
    x = 484,134.86/1,012.10
  6. Step 6: Final answer
    x = 478.35

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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.