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Finding the Fourth Proportional to 8,139.78, 12,211.29 and 2,592.95

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Solution

The fourth proportional to 8,139.78, 12,211.29 and 2,592.95 is: 3,889.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.78 : 12,211.29 = 2,592.95 : x
  2. Step 2: Convert to fraction form
    8,139.78/12,211.29 = 2,592.95/x
  3. Step 3: Cross multiply
    8,139.78x = 12,211.29 × 2,592.95
  4. Step 4: Simplify right side
    8,139.78x = 31,663,203.35
  5. Step 5: Solve for x
    x = 31,663,203.35/8,139.78
  6. Step 6: Final answer
    x = 3,889.93

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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.