Home / 13,988.80-20,977.92-5,221.76

Finding the Fourth Proportional to 13,988.80, 20,977.92 and 5,221.76

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Solution

The fourth proportional to 13,988.80, 20,977.92 and 5,221.76 is: 7,830.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.80 : 20,977.92 = 5,221.76 : x
  2. Step 2: Convert to fraction form
    13,988.80/20,977.92 = 5,221.76/x
  3. Step 3: Cross multiply
    13,988.80x = 20,977.92 × 5,221.76
  4. Step 4: Simplify right side
    13,988.80x = 109,541,663.54
  5. Step 5: Solve for x
    x = 109,541,663.54/13,988.80
  6. Step 6: Final answer
    x = 7,830.67

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1.5x scale

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.