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Finding the Fourth Proportional to 13,442.80, 20,139.90 and 10,964.20

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Solution

The fourth proportional to 13,442.80, 20,139.90 and 10,964.20 is: 16,426.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,442.80 : 20,139.90 = 10,964.20 : x
  2. Step 2: Convert to fraction form
    13,442.80/20,139.90 = 10,964.20/x
  3. Step 3: Cross multiply
    13,442.80x = 20,139.90 × 10,964.20
  4. Step 4: Simplify right side
    13,442.80x = 220,817,891.58
  5. Step 5: Solve for x
    x = 220,817,891.58/13,442.80
  6. Step 6: Final answer
    x = 16,426.48

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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.