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Finding the Fourth Proportional to 28,610.40, 42,915.68 and 8,891.84

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Solution

The fourth proportional to 28,610.40, 42,915.68 and 8,891.84 is: 13,337.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,610.40 : 42,915.68 = 8,891.84 : x
  2. Step 2: Convert to fraction form
    28,610.40/42,915.68 = 8,891.84/x
  3. Step 3: Cross multiply
    28,610.40x = 42,915.68 × 8,891.84
  4. Step 4: Simplify right side
    28,610.40x = 381,599,360.05
  5. Step 5: Solve for x
    x = 381,599,360.05/28,610.40
  6. Step 6: Final answer
    x = 13,337.78

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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.