Home / 20,717.80-31,080.70-8,871.40

Finding the Fourth Proportional to 20,717.80, 31,080.70 and 8,871.40

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Solution

The fourth proportional to 20,717.80, 31,080.70 and 8,871.40 is: 13,308.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,717.80 : 31,080.70 = 8,871.40 : x
  2. Step 2: Convert to fraction form
    20,717.80/31,080.70 = 8,871.40/x
  3. Step 3: Cross multiply
    20,717.80x = 31,080.70 × 8,871.40
  4. Step 4: Simplify right side
    20,717.80x = 275,729,321.98
  5. Step 5: Solve for x
    x = 275,729,321.98/20,717.80
  6. Step 6: Final answer
    x = 13,308.81

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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.