Home / 20,687.50-31,031.88-5,105.13

Finding the Fourth Proportional to 20,687.50, 31,031.88 and 5,105.13

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Solution

The fourth proportional to 20,687.50, 31,031.88 and 5,105.13 is: 7,657.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.50 : 31,031.88 = 5,105.13 : x
  2. Step 2: Convert to fraction form
    20,687.50/31,031.88 = 5,105.13/x
  3. Step 3: Cross multiply
    20,687.50x = 31,031.88 × 5,105.13
  4. Step 4: Simplify right side
    20,687.50x = 158,421,781.54
  5. Step 5: Solve for x
    x = 158,421,781.54/20,687.50
  6. Step 6: Final answer
    x = 7,657.85

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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.