Home / 21,289.20-31,929.69-8,138.49

Finding the Fourth Proportional to 21,289.20, 31,929.69 and 8,138.49

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Solution

The fourth proportional to 21,289.20, 31,929.69 and 8,138.49 is: 12,206.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.20 : 31,929.69 = 8,138.49 : x
  2. Step 2: Convert to fraction form
    21,289.20/31,929.69 = 8,138.49/x
  3. Step 3: Cross multiply
    21,289.20x = 31,929.69 × 8,138.49
  4. Step 4: Simplify right side
    21,289.20x = 259,859,462.77
  5. Step 5: Solve for x
    x = 259,859,462.77/21,289.20
  6. Step 6: Final answer
    x = 12,206.16

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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.