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Finding the Fourth Proportional to 13,780.68, 20,671.02 and 4,421.67

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Solution

The fourth proportional to 13,780.68, 20,671.02 and 4,421.67 is: 6,632.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.68 : 20,671.02 = 4,421.67 : x
  2. Step 2: Convert to fraction form
    13,780.68/20,671.02 = 4,421.67/x
  3. Step 3: Cross multiply
    13,780.68x = 20,671.02 × 4,421.67
  4. Step 4: Simplify right side
    13,780.68x = 91,400,429.00
  5. Step 5: Solve for x
    x = 91,400,429.00/13,780.68
  6. Step 6: Final answer
    x = 6,632.51

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Similar ratio
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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.