Home / 20,721.20-31,008.90-14,451.80

Finding the Fourth Proportional to 20,721.20, 31,008.90 and 14,451.80

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Solution

The fourth proportional to 20,721.20, 31,008.90 and 14,451.80 is: 21,626.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.20 : 31,008.90 = 14,451.80 : x
  2. Step 2: Convert to fraction form
    20,721.20/31,008.90 = 14,451.80/x
  3. Step 3: Cross multiply
    20,721.20x = 31,008.90 × 14,451.80
  4. Step 4: Simplify right side
    20,721.20x = 448,134,421.02
  5. Step 5: Solve for x
    x = 448,134,421.02/20,721.20
  6. Step 6: Final answer
    x = 21,626.86

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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.