Home / 20,711.20-31,091.10-20,565.40

Finding the Fourth Proportional to 20,711.20, 31,091.10 and 20,565.40

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Solution

The fourth proportional to 20,711.20, 31,091.10 and 20,565.40 is: 30,872.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.20 : 31,091.10 = 20,565.40 : x
  2. Step 2: Convert to fraction form
    20,711.20/31,091.10 = 20,565.40/x
  3. Step 3: Cross multiply
    20,711.20x = 31,091.10 × 20,565.40
  4. Step 4: Simplify right side
    20,711.20x = 639,400,907.94
  5. Step 5: Solve for x
    x = 639,400,907.94/20,711.20
  6. Step 6: Final answer
    x = 30,872.23

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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.