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Finding the Fourth Proportional to 1,394.85, 1,920.99 and 1,364.61

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Solution

The fourth proportional to 1,394.85, 1,920.99 and 1,364.61 is: 1,879.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.85 : 1,920.99 = 1,364.61 : x
  2. Step 2: Convert to fraction form
    1,394.85/1,920.99 = 1,364.61/x
  3. Step 3: Cross multiply
    1,394.85x = 1,920.99 × 1,364.61
  4. Step 4: Simplify right side
    1,394.85x = 2,621,402.16
  5. Step 5: Solve for x
    x = 2,621,402.16/1,394.85
  6. Step 6: Final answer
    x = 1,879.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.