Home / 20,819.40-31,228.52-9,719.96

Finding the Fourth Proportional to 20,819.40, 31,228.52 and 9,719.96

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Solution

The fourth proportional to 20,819.40, 31,228.52 and 9,719.96 is: 14,579.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.40 : 31,228.52 = 9,719.96 : x
  2. Step 2: Convert to fraction form
    20,819.40/31,228.52 = 9,719.96/x
  3. Step 3: Cross multiply
    20,819.40x = 31,228.52 × 9,719.96
  4. Step 4: Simplify right side
    20,819.40x = 303,539,965.26
  5. Step 5: Solve for x
    x = 303,539,965.26/20,819.40
  6. Step 6: Final answer
    x = 14,579.67

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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.