Home / 20,717.70-31,080.60-8,871.45

Finding the Fourth Proportional to 20,717.70, 31,080.60 and 8,871.45

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Solution

The fourth proportional to 20,717.70, 31,080.60 and 8,871.45 is: 13,308.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,717.70 : 31,080.60 = 8,871.45 : x
  2. Step 2: Convert to fraction form
    20,717.70/31,080.60 = 8,871.45/x
  3. Step 3: Cross multiply
    20,717.70x = 31,080.60 × 8,871.45
  4. Step 4: Simplify right side
    20,717.70x = 275,729,988.87
  5. Step 5: Solve for x
    x = 275,729,988.87/20,717.70
  6. Step 6: Final answer
    x = 13,308.91

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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.