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Finding the Fourth Proportional to 15,989.80, 22,065.42 and 8,721.62

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Solution

The fourth proportional to 15,989.80, 22,065.42 and 8,721.62 is: 12,035.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,989.80 : 22,065.42 = 8,721.62 : x
  2. Step 2: Convert to fraction form
    15,989.80/22,065.42 = 8,721.62/x
  3. Step 3: Cross multiply
    15,989.80x = 22,065.42 × 8,721.62
  4. Step 4: Simplify right side
    15,989.80x = 192,446,208.38
  5. Step 5: Solve for x
    x = 192,446,208.38/15,989.80
  6. Step 6: Final answer
    x = 12,035.56

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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.