Home / 20,687.81-31,031.10-5,105.43

Finding the Fourth Proportional to 20,687.81, 31,031.10 and 5,105.43

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Solution

The fourth proportional to 20,687.81, 31,031.10 and 5,105.43 is: 7,658.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.81 : 31,031.10 = 5,105.43 : x
  2. Step 2: Convert to fraction form
    20,687.81/31,031.10 = 5,105.43/x
  3. Step 3: Cross multiply
    20,687.81x = 31,031.10 × 5,105.43
  4. Step 4: Simplify right side
    20,687.81x = 158,427,108.87
  5. Step 5: Solve for x
    x = 158,427,108.87/20,687.81
  6. Step 6: Final answer
    x = 7,658.00

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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.