Home / 20,839.28-31,241.64-7,689.20

Finding the Fourth Proportional to 20,839.28, 31,241.64 and 7,689.20

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Solution

The fourth proportional to 20,839.28, 31,241.64 and 7,689.20 is: 11,527.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.28 : 31,241.64 = 7,689.20 : x
  2. Step 2: Convert to fraction form
    20,839.28/31,241.64 = 7,689.20/x
  3. Step 3: Cross multiply
    20,839.28x = 31,241.64 × 7,689.20
  4. Step 4: Simplify right side
    20,839.28x = 240,223,218.29
  5. Step 5: Solve for x
    x = 240,223,218.29/20,839.28
  6. Step 6: Final answer
    x = 11,527.42

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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.