Home / 21,311.76-31,944.32-8,158.40

Finding the Fourth Proportional to 21,311.76, 31,944.32 and 8,158.40

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Solution

The fourth proportional to 21,311.76, 31,944.32 and 8,158.40 is: 12,228.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311.76 : 31,944.32 = 8,158.40 : x
  2. Step 2: Convert to fraction form
    21,311.76/31,944.32 = 8,158.40/x
  3. Step 3: Cross multiply
    21,311.76x = 31,944.32 × 8,158.40
  4. Step 4: Simplify right side
    21,311.76x = 260,614,540.29
  5. Step 5: Solve for x
    x = 260,614,540.29/21,311.76
  6. Step 6: Final answer
    x = 12,228.67

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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.