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Finding the Fourth Proportional to 21,990.68, 32,986 and 8,839.97

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Solution

The fourth proportional to 21,990.68, 32,986 and 8,839.97 is: 13,259.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.68 : 32,986 = 8,839.97 : x
  2. Step 2: Convert to fraction form
    21,990.68/32,986 = 8,839.97/x
  3. Step 3: Cross multiply
    21,990.68x = 32,986 × 8,839.97
  4. Step 4: Simplify right side
    21,990.68x = 291,595,250.42
  5. Step 5: Solve for x
    x = 291,595,250.42/21,990.68
  6. Step 6: Final answer
    x = 13,259.95

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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.