Home / 5,115.20-7,672.56-1,605.12

Finding the Fourth Proportional to 5,115.20, 7,672.56 and 1,605.12

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Solution

The fourth proportional to 5,115.20, 7,672.56 and 1,605.12 is: 2,407.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.20 : 7,672.56 = 1,605.12 : x
  2. Step 2: Convert to fraction form
    5,115.20/7,672.56 = 1,605.12/x
  3. Step 3: Cross multiply
    5,115.20x = 7,672.56 × 1,605.12
  4. Step 4: Simplify right side
    5,115.20x = 12,315,379.51
  5. Step 5: Solve for x
    x = 12,315,379.51/5,115.20
  6. Step 6: Final answer
    x = 2,407.61

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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.