Home / 20,697.76-31,046.28-5,115.16

Finding the Fourth Proportional to 20,697.76, 31,046.28 and 5,115.16

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Solution

The fourth proportional to 20,697.76, 31,046.28 and 5,115.16 is: 7,672.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,697.76 : 31,046.28 = 5,115.16 : x
  2. Step 2: Convert to fraction form
    20,697.76/31,046.28 = 5,115.16/x
  3. Step 3: Cross multiply
    20,697.76x = 31,046.28 × 5,115.16
  4. Step 4: Simplify right side
    20,697.76x = 158,806,689.60
  5. Step 5: Solve for x
    x = 158,806,689.60/20,697.76
  6. Step 6: Final answer
    x = 7,672.65

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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.