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Finding the Fourth Proportional to 15,885.28, 21,920.88 and 8,811.55

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Solution

The fourth proportional to 15,885.28, 21,920.88 and 8,811.55 is: 12,159.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.28 : 21,920.88 = 8,811.55 : x
  2. Step 2: Convert to fraction form
    15,885.28/21,920.88 = 8,811.55/x
  3. Step 3: Cross multiply
    15,885.28x = 21,920.88 × 8,811.55
  4. Step 4: Simplify right side
    15,885.28x = 193,156,930.16
  5. Step 5: Solve for x
    x = 193,156,930.16/15,885.28
  6. Step 6: Final answer
    x = 12,159.49

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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.