Home / 21,408.20-32,272.76-19,981

Finding the Fourth Proportional to 21,408.20, 32,272.76 and 19,981

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Solution

The fourth proportional to 21,408.20, 32,272.76 and 19,981 is: 30,121.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,408.20 : 32,272.76 = 19,981 : x
  2. Step 2: Convert to fraction form
    21,408.20/32,272.76 = 19,981/x
  3. Step 3: Cross multiply
    21,408.20x = 32,272.76 × 19,981
  4. Step 4: Simplify right side
    21,408.20x = 644,842,017.56
  5. Step 5: Solve for x
    x = 644,842,017.56/21,408.20
  6. Step 6: Final answer
    x = 30,121.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.