Home / 21,221.86-29,278.20-13,151.80

Finding the Fourth Proportional to 21,221.86, 29,278.20 and 13,151.80

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Solution

The fourth proportional to 21,221.86, 29,278.20 and 13,151.80 is: 18,144.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221.86 : 29,278.20 = 13,151.80 : x
  2. Step 2: Convert to fraction form
    21,221.86/29,278.20 = 13,151.80/x
  3. Step 3: Cross multiply
    21,221.86x = 29,278.20 × 13,151.80
  4. Step 4: Simplify right side
    21,221.86x = 385,061,030.76
  5. Step 5: Solve for x
    x = 385,061,030.76/21,221.86
  6. Step 6: Final answer
    x = 18,144.55

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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.