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Finding the Fourth Proportional to 22,781.72, 34,172.80 and 7,990.99

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Solution

The fourth proportional to 22,781.72, 34,172.80 and 7,990.99 is: 11,986.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,781.72 : 34,172.80 = 7,990.99 : x
  2. Step 2: Convert to fraction form
    22,781.72/34,172.80 = 7,990.99/x
  3. Step 3: Cross multiply
    22,781.72x = 34,172.80 × 7,990.99
  4. Step 4: Simplify right side
    22,781.72x = 273,074,503.07
  5. Step 5: Solve for x
    x = 273,074,503.07/22,781.72
  6. Step 6: Final answer
    x = 11,986.56

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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.