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Finding the Fourth Proportional to 15,138.06, 20,890.80 and 8,423.97

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Solution

The fourth proportional to 15,138.06, 20,890.80 and 8,423.97 is: 11,625.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.06 : 20,890.80 = 8,423.97 : x
  2. Step 2: Convert to fraction form
    15,138.06/20,890.80 = 8,423.97/x
  3. Step 3: Cross multiply
    15,138.06x = 20,890.80 × 8,423.97
  4. Step 4: Simplify right side
    15,138.06x = 175,983,472.48
  5. Step 5: Solve for x
    x = 175,983,472.48/15,138.06
  6. Step 6: Final answer
    x = 11,625.23

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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.