Home / 20,978.80-31,442.23-9,727.37

Finding the Fourth Proportional to 20,978.80, 31,442.23 and 9,727.37

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Solution

The fourth proportional to 20,978.80, 31,442.23 and 9,727.37 is: 14,579.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.80 : 31,442.23 = 9,727.37 : x
  2. Step 2: Convert to fraction form
    20,978.80/31,442.23 = 9,727.37/x
  3. Step 3: Cross multiply
    20,978.80x = 31,442.23 × 9,727.37
  4. Step 4: Simplify right side
    20,978.80x = 305,850,034.54
  5. Step 5: Solve for x
    x = 305,850,034.54/20,978.80
  6. Step 6: Final answer
    x = 14,579.01

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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.