Home / 20,988.28-28,964.10-11,557.54

Finding the Fourth Proportional to 20,988.28, 28,964.10 and 11,557.54

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Solution

The fourth proportional to 20,988.28, 28,964.10 and 11,557.54 is: 15,949.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.28 : 28,964.10 = 11,557.54 : x
  2. Step 2: Convert to fraction form
    20,988.28/28,964.10 = 11,557.54/x
  3. Step 3: Cross multiply
    20,988.28x = 28,964.10 × 11,557.54
  4. Step 4: Simplify right side
    20,988.28x = 334,753,744.31
  5. Step 5: Solve for x
    x = 334,753,744.31/20,988.28
  6. Step 6: Final answer
    x = 15,949.56

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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.