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Finding the Fourth Proportional to 8,915.92, 12,278.88 and 8,722.16

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Solution

The fourth proportional to 8,915.92, 12,278.88 and 8,722.16 is: 12,012.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.92 : 12,278.88 = 8,722.16 : x
  2. Step 2: Convert to fraction form
    8,915.92/12,278.88 = 8,722.16/x
  3. Step 3: Cross multiply
    8,915.92x = 12,278.88 × 8,722.16
  4. Step 4: Simplify right side
    8,915.92x = 107,098,355.98
  5. Step 5: Solve for x
    x = 107,098,355.98/8,915.92
  6. Step 6: Final answer
    x = 12,012.04

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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.