Home / 5,115.10-7,672.65-4,279.90

Finding the Fourth Proportional to 5,115.10, 7,672.65 and 4,279.90

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Solution

The fourth proportional to 5,115.10, 7,672.65 and 4,279.90 is: 6,419.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.10 : 7,672.65 = 4,279.90 : x
  2. Step 2: Convert to fraction form
    5,115.10/7,672.65 = 4,279.90/x
  3. Step 3: Cross multiply
    5,115.10x = 7,672.65 × 4,279.90
  4. Step 4: Simplify right side
    5,115.10x = 32,838,174.74
  5. Step 5: Solve for x
    x = 32,838,174.74/5,115.10
  6. Step 6: Final answer
    x = 6,419.85

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1.5x scale

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.