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Finding the Fourth Proportional to 5,281.38, 7,922.10 and 1,385.70

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Solution

The fourth proportional to 5,281.38, 7,922.10 and 1,385.70 is: 2,078.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,281.38 : 7,922.10 = 1,385.70 : x
  2. Step 2: Convert to fraction form
    5,281.38/7,922.10 = 1,385.70/x
  3. Step 3: Cross multiply
    5,281.38x = 7,922.10 × 1,385.70
  4. Step 4: Simplify right side
    5,281.38x = 10,977,653.97
  5. Step 5: Solve for x
    x = 10,977,653.97/5,281.38
  6. Step 6: Final answer
    x = 2,078.56

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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.