Home / 5,321.18-7,981.78-1,425.90

Finding the Fourth Proportional to 5,321.18, 7,981.78 and 1,425.90

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Solution

The fourth proportional to 5,321.18, 7,981.78 and 1,425.90 is: 2,138.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,321.18 : 7,981.78 = 1,425.90 : x
  2. Step 2: Convert to fraction form
    5,321.18/7,981.78 = 1,425.90/x
  3. Step 3: Cross multiply
    5,321.18x = 7,981.78 × 1,425.90
  4. Step 4: Simplify right side
    5,321.18x = 11,381,220.10
  5. Step 5: Solve for x
    x = 11,381,220.10/5,321.18
  6. Step 6: Final answer
    x = 2,138.85

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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.