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Finding the Fourth Proportional to 13,908.60, 20,862.90 and 5,141.70

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Solution

The fourth proportional to 13,908.60, 20,862.90 and 5,141.70 is: 7,712.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,908.60 : 20,862.90 = 5,141.70 : x
  2. Step 2: Convert to fraction form
    13,908.60/20,862.90 = 5,141.70/x
  3. Step 3: Cross multiply
    13,908.60x = 20,862.90 × 5,141.70
  4. Step 4: Simplify right side
    13,908.60x = 107,270,772.93
  5. Step 5: Solve for x
    x = 107,270,772.93/13,908.60
  6. Step 6: Final answer
    x = 7,712.55

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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.