Home / 21,287.75-31,959.89-18,187.67

Finding the Fourth Proportional to 21,287.75, 31,959.89 and 18,187.67

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Solution

The fourth proportional to 21,287.75, 31,959.89 and 18,187.67 is: 27,305.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,287.75 : 31,959.89 = 18,187.67 : x
  2. Step 2: Convert to fraction form
    21,287.75/31,959.89 = 18,187.67/x
  3. Step 3: Cross multiply
    21,287.75x = 31,959.89 × 18,187.67
  4. Step 4: Simplify right side
    21,287.75x = 581,275,841.62
  5. Step 5: Solve for x
    x = 581,275,841.62/21,287.75
  6. Step 6: Final answer
    x = 27,305.65

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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.