Home / 20,978.73-31,439.75-11,618.37

Finding the Fourth Proportional to 20,978.73, 31,439.75 and 11,618.37

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Solution

The fourth proportional to 20,978.73, 31,439.75 and 11,618.37 is: 17,411.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.73 : 31,439.75 = 11,618.37 : x
  2. Step 2: Convert to fraction form
    20,978.73/31,439.75 = 11,618.37/x
  3. Step 3: Cross multiply
    20,978.73x = 31,439.75 × 11,618.37
  4. Step 4: Simplify right side
    20,978.73x = 365,278,590.12
  5. Step 5: Solve for x
    x = 365,278,590.12/20,978.73
  6. Step 6: Final answer
    x = 17,411.85

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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.