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Finding the Fourth Proportional to 12,540.57, 18,787.79 and 7,859.70

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Solution

The fourth proportional to 12,540.57, 18,787.79 and 7,859.70 is: 11,775.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,540.57 : 18,787.79 = 7,859.70 : x
  2. Step 2: Convert to fraction form
    12,540.57/18,787.79 = 7,859.70/x
  3. Step 3: Cross multiply
    12,540.57x = 18,787.79 × 7,859.70
  4. Step 4: Simplify right side
    12,540.57x = 147,666,353.76
  5. Step 5: Solve for x
    x = 147,666,353.76/12,540.57
  6. Step 6: Final answer
    x = 11,775.09

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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.