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Finding the Fourth Proportional to 13,915.62, 20,821.07 and 8,560.17

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Solution

The fourth proportional to 13,915.62, 20,821.07 and 8,560.17 is: 12,808.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.62 : 20,821.07 = 8,560.17 : x
  2. Step 2: Convert to fraction form
    13,915.62/20,821.07 = 8,560.17/x
  3. Step 3: Cross multiply
    13,915.62x = 20,821.07 × 8,560.17
  4. Step 4: Simplify right side
    13,915.62x = 178,231,855.98
  5. Step 5: Solve for x
    x = 178,231,855.98/13,915.62
  6. Step 6: Final answer
    x = 12,808.04

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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.