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Finding the Fourth Proportional to 18,756.80, 25,880.64 and 10,371.68

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Solution

The fourth proportional to 18,756.80, 25,880.64 and 10,371.68 is: 14,310.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.80 : 25,880.64 = 10,371.68 : x
  2. Step 2: Convert to fraction form
    18,756.80/25,880.64 = 10,371.68/x
  3. Step 3: Cross multiply
    18,756.80x = 25,880.64 × 10,371.68
  4. Step 4: Simplify right side
    18,756.80x = 268,425,716.28
  5. Step 5: Solve for x
    x = 268,425,716.28/18,756.80
  6. Step 6: Final answer
    x = 14,310.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.