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Finding the Fourth Proportional to 15,934.90, 21,990.76 and 8,861.82

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Solution

The fourth proportional to 15,934.90, 21,990.76 and 8,861.82 is: 12,229.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,934.90 : 21,990.76 = 8,861.82 : x
  2. Step 2: Convert to fraction form
    15,934.90/21,990.76 = 8,861.82/x
  3. Step 3: Cross multiply
    15,934.90x = 21,990.76 × 8,861.82
  4. Step 4: Simplify right side
    15,934.90x = 194,878,156.78
  5. Step 5: Solve for x
    x = 194,878,156.78/15,934.90
  6. Step 6: Final answer
    x = 12,229.64

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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.