Home / 20,778.56-31,150.49-9,679.53

Finding the Fourth Proportional to 20,778.56, 31,150.49 and 9,679.53

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Solution

The fourth proportional to 20,778.56, 31,150.49 and 9,679.53 is: 14,511.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.56 : 31,150.49 = 9,679.53 : x
  2. Step 2: Convert to fraction form
    20,778.56/31,150.49 = 9,679.53/x
  3. Step 3: Cross multiply
    20,778.56x = 31,150.49 × 9,679.53
  4. Step 4: Simplify right side
    20,778.56x = 301,522,054.07
  5. Step 5: Solve for x
    x = 301,522,054.07/20,778.56
  6. Step 6: Final answer
    x = 14,511.21

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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.