Home / 20,972.18-31,459.46-8,491.91

Finding the Fourth Proportional to 20,972.18, 31,459.46 and 8,491.91

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Solution

The fourth proportional to 20,972.18, 31,459.46 and 8,491.91 is: 12,738.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.18 : 31,459.46 = 8,491.91 : x
  2. Step 2: Convert to fraction form
    20,972.18/31,459.46 = 8,491.91/x
  3. Step 3: Cross multiply
    20,972.18x = 31,459.46 × 8,491.91
  4. Step 4: Simplify right side
    20,972.18x = 267,150,703.21
  5. Step 5: Solve for x
    x = 267,150,703.21/20,972.18
  6. Step 6: Final answer
    x = 12,738.34

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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.