Home / 21,327.20-31,990.80-20,751.20

Finding the Fourth Proportional to 21,327.20, 31,990.80 and 20,751.20

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Solution

The fourth proportional to 21,327.20, 31,990.80 and 20,751.20 is: 31,126.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,327.20 : 31,990.80 = 20,751.20 : x
  2. Step 2: Convert to fraction form
    21,327.20/31,990.80 = 20,751.20/x
  3. Step 3: Cross multiply
    21,327.20x = 31,990.80 × 20,751.20
  4. Step 4: Simplify right side
    21,327.20x = 663,847,488.96
  5. Step 5: Solve for x
    x = 663,847,488.96/21,327.20
  6. Step 6: Final answer
    x = 31,126.80

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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.