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Finding the Fourth Proportional to 1,394.70, 2,092.05 and 1,275.90

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Solution

The fourth proportional to 1,394.70, 2,092.05 and 1,275.90 is: 1,913.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.70 : 2,092.05 = 1,275.90 : x
  2. Step 2: Convert to fraction form
    1,394.70/2,092.05 = 1,275.90/x
  3. Step 3: Cross multiply
    1,394.70x = 2,092.05 × 1,275.90
  4. Step 4: Simplify right side
    1,394.70x = 2,669,246.60
  5. Step 5: Solve for x
    x = 2,669,246.60/1,394.70
  6. Step 6: Final answer
    x = 1,913.85

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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.