Home / 20,780.40-31,166.12-5,986.56

Finding the Fourth Proportional to 20,780.40, 31,166.12 and 5,986.56

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Solution

The fourth proportional to 20,780.40, 31,166.12 and 5,986.56 is: 8,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.40 : 31,166.12 = 5,986.56 : x
  2. Step 2: Convert to fraction form
    20,780.40/31,166.12 = 5,986.56/x
  3. Step 3: Cross multiply
    20,780.40x = 31,166.12 × 5,986.56
  4. Step 4: Simplify right side
    20,780.40x = 186,577,847.35
  5. Step 5: Solve for x
    x = 186,577,847.35/20,780.40
  6. Step 6: Final answer
    x = 8,978.55

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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.