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Finding the Fourth Proportional to 18,915.88, 28,345.82 and 16,839.76

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Solution

The fourth proportional to 18,915.88, 28,345.82 and 16,839.76 is: 25,234.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.88 : 28,345.82 = 16,839.76 : x
  2. Step 2: Convert to fraction form
    18,915.88/28,345.82 = 16,839.76/x
  3. Step 3: Cross multiply
    18,915.88x = 28,345.82 × 16,839.76
  4. Step 4: Simplify right side
    18,915.88x = 477,336,805.80
  5. Step 5: Solve for x
    x = 477,336,805.80/18,915.88
  6. Step 6: Final answer
    x = 25,234.71

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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.