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Finding the Fourth Proportional to 13,862.76, 20,766.60 and 12,728.76

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Solution

The fourth proportional to 13,862.76, 20,766.60 and 12,728.76 is: 19,067.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,862.76 : 20,766.60 = 12,728.76 : x
  2. Step 2: Convert to fraction form
    13,862.76/20,766.60 = 12,728.76/x
  3. Step 3: Cross multiply
    13,862.76x = 20,766.60 × 12,728.76
  4. Step 4: Simplify right side
    13,862.76x = 264,333,067.42
  5. Step 5: Solve for x
    x = 264,333,067.42/13,862.76
  6. Step 6: Final answer
    x = 19,067.85

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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.