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Finding the Fourth Proportional to 15,200.91, 20,980.76 and 8,915.31

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Solution

The fourth proportional to 15,200.91, 20,980.76 and 8,915.31 is: 12,305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,200.91 : 20,980.76 = 8,915.31 : x
  2. Step 2: Convert to fraction form
    15,200.91/20,980.76 = 8,915.31/x
  3. Step 3: Cross multiply
    15,200.91x = 20,980.76 × 8,915.31
  4. Step 4: Simplify right side
    15,200.91x = 187,049,934.86
  5. Step 5: Solve for x
    x = 187,049,934.86/15,200.91
  6. Step 6: Final answer
    x = 12,305.18

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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.