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Finding the Fourth Proportional to 15,042.78, 20,758.70 and 8,236.80

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Solution

The fourth proportional to 15,042.78, 20,758.70 and 8,236.80 is: 11,366.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,042.78 : 20,758.70 = 8,236.80 : x
  2. Step 2: Convert to fraction form
    15,042.78/20,758.70 = 8,236.80/x
  3. Step 3: Cross multiply
    15,042.78x = 20,758.70 × 8,236.80
  4. Step 4: Simplify right side
    15,042.78x = 170,985,260.16
  5. Step 5: Solve for x
    x = 170,985,260.16/15,042.78
  6. Step 6: Final answer
    x = 11,366.60

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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.