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Finding the Fourth Proportional to 15,934.84, 21,990.11 and 8,861.20

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Solution

The fourth proportional to 15,934.84, 21,990.11 and 8,861.20 is: 12,228.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,934.84 : 21,990.11 = 8,861.20 : x
  2. Step 2: Convert to fraction form
    15,934.84/21,990.11 = 8,861.20/x
  3. Step 3: Cross multiply
    15,934.84x = 21,990.11 × 8,861.20
  4. Step 4: Simplify right side
    15,934.84x = 194,858,762.73
  5. Step 5: Solve for x
    x = 194,858,762.73/15,934.84
  6. Step 6: Final answer
    x = 12,228.47

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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.