Home / 22,079.76-30,438.84-15,781.20

Finding the Fourth Proportional to 22,079.76, 30,438.84 and 15,781.20

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Solution

The fourth proportional to 22,079.76, 30,438.84 and 15,781.20 is: 21,755.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,079.76 : 30,438.84 = 15,781.20 : x
  2. Step 2: Convert to fraction form
    22,079.76/30,438.84 = 15,781.20/x
  3. Step 3: Cross multiply
    22,079.76x = 30,438.84 × 15,781.20
  4. Step 4: Simplify right side
    22,079.76x = 480,361,421.81
  5. Step 5: Solve for x
    x = 480,361,421.81/22,079.76
  6. Step 6: Final answer
    x = 21,755.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.