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Finding the Fourth Proportional to 15,200.72, 20,979.08 and 8,915.12

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Solution

The fourth proportional to 15,200.72, 20,979.08 and 8,915.12 is: 12,304.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,200.72 : 20,979.08 = 8,915.12 : x
  2. Step 2: Convert to fraction form
    15,200.72/20,979.08 = 8,915.12/x
  3. Step 3: Cross multiply
    15,200.72x = 20,979.08 × 8,915.12
  4. Step 4: Simplify right side
    15,200.72x = 187,031,015.69
  5. Step 5: Solve for x
    x = 187,031,015.69/15,200.72
  6. Step 6: Final answer
    x = 12,304.09

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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.