Home / 20,687.40-31,031.52-5,105.16

Finding the Fourth Proportional to 20,687.40, 31,031.52 and 5,105.16

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Solution

The fourth proportional to 20,687.40, 31,031.52 and 5,105.16 is: 7,657.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.40 : 31,031.52 = 5,105.16 : x
  2. Step 2: Convert to fraction form
    20,687.40/31,031.52 = 5,105.16/x
  3. Step 3: Cross multiply
    20,687.40x = 31,031.52 × 5,105.16
  4. Step 4: Simplify right side
    20,687.40x = 158,420,874.64
  5. Step 5: Solve for x
    x = 158,420,874.64/20,687.40
  6. Step 6: Final answer
    x = 7,657.84

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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.