Home / 21,289.75-31,962.89-18,189.67

Finding the Fourth Proportional to 21,289.75, 31,962.89 and 18,189.67

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Solution

The fourth proportional to 21,289.75, 31,962.89 and 18,189.67 is: 27,308.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.75 : 31,962.89 = 18,189.67 : x
  2. Step 2: Convert to fraction form
    21,289.75/31,962.89 = 18,189.67/x
  3. Step 3: Cross multiply
    21,289.75x = 31,962.89 × 18,189.67
  4. Step 4: Simplify right side
    21,289.75x = 581,394,421.35
  5. Step 5: Solve for x
    x = 581,394,421.35/21,289.75
  6. Step 6: Final answer
    x = 27,308.65

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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.