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Finding the Fourth Proportional to 13,711.47, 20,555.05 and 6,687.55

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Solution

The fourth proportional to 13,711.47, 20,555.05 and 6,687.55 is: 10,025.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,711.47 : 20,555.05 = 6,687.55 : x
  2. Step 2: Convert to fraction form
    13,711.47/20,555.05 = 6,687.55/x
  3. Step 3: Cross multiply
    13,711.47x = 20,555.05 × 6,687.55
  4. Step 4: Simplify right side
    13,711.47x = 137,462,924.63
  5. Step 5: Solve for x
    x = 137,462,924.63/13,711.47
  6. Step 6: Final answer
    x = 10,025.40

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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.