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Finding the Fourth Proportional to 28,612.68, 42,915.36 and 8,890.80

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Solution

The fourth proportional to 28,612.68, 42,915.36 and 8,890.80 is: 13,335.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.68 : 42,915.36 = 8,890.80 : x
  2. Step 2: Convert to fraction form
    28,612.68/42,915.36 = 8,890.80/x
  3. Step 3: Cross multiply
    28,612.68x = 42,915.36 × 8,890.80
  4. Step 4: Simplify right side
    28,612.68x = 381,551,882.69
  5. Step 5: Solve for x
    x = 381,551,882.69/28,612.68
  6. Step 6: Final answer
    x = 13,335.06

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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.