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Finding the Fourth Proportional to 21,990.03, 32,972.55 and 8,655.80

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Solution

The fourth proportional to 21,990.03, 32,972.55 and 8,655.80 is: 12,978.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.03 : 32,972.55 = 8,655.80 : x
  2. Step 2: Convert to fraction form
    21,990.03/32,972.55 = 8,655.80/x
  3. Step 3: Cross multiply
    21,990.03x = 32,972.55 × 8,655.80
  4. Step 4: Simplify right side
    21,990.03x = 285,403,757.07
  5. Step 5: Solve for x
    x = 285,403,757.07/21,990.03
  6. Step 6: Final answer
    x = 12,978.78

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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.