Home / 20,871.12-31,306.62-5,288.70

Finding the Fourth Proportional to 20,871.12, 31,306.62 and 5,288.70

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Solution

The fourth proportional to 20,871.12, 31,306.62 and 5,288.70 is: 7,933.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.12 : 31,306.62 = 5,288.70 : x
  2. Step 2: Convert to fraction form
    20,871.12/31,306.62 = 5,288.70/x
  3. Step 3: Cross multiply
    20,871.12x = 31,306.62 × 5,288.70
  4. Step 4: Simplify right side
    20,871.12x = 165,571,321.19
  5. Step 5: Solve for x
    x = 165,571,321.19/20,871.12
  6. Step 6: Final answer
    x = 7,933.03

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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.