Home / 20,986.10-31,479.15-20,179.70

Finding the Fourth Proportional to 20,986.10, 31,479.15 and 20,179.70

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Solution

The fourth proportional to 20,986.10, 31,479.15 and 20,179.70 is: 30,269.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.10 : 31,479.15 = 20,179.70 : x
  2. Step 2: Convert to fraction form
    20,986.10/31,479.15 = 20,179.70/x
  3. Step 3: Cross multiply
    20,986.10x = 31,479.15 × 20,179.70
  4. Step 4: Simplify right side
    20,986.10x = 635,239,803.26
  5. Step 5: Solve for x
    x = 635,239,803.26/20,986.10
  6. Step 6: Final answer
    x = 30,269.55

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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.