Home / 20,989.28-28,967.25-15,674.87

Finding the Fourth Proportional to 20,989.28, 28,967.25 and 15,674.87

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Solution

The fourth proportional to 20,989.28, 28,967.25 and 15,674.87 is: 21,632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.28 : 28,967.25 = 15,674.87 : x
  2. Step 2: Convert to fraction form
    20,989.28/28,967.25 = 15,674.87/x
  3. Step 3: Cross multiply
    20,989.28x = 28,967.25 × 15,674.87
  4. Step 4: Simplify right side
    20,989.28x = 454,057,878.01
  5. Step 5: Solve for x
    x = 454,057,878.01/20,989.28
  6. Step 6: Final answer
    x = 21,632.85

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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.