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Finding the Fourth Proportional to 1,394.97, 1,924.64 and 805.55

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Solution

The fourth proportional to 1,394.97, 1,924.64 and 805.55 is: 1,111.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.97 : 1,924.64 = 805.55 : x
  2. Step 2: Convert to fraction form
    1,394.97/1,924.64 = 805.55/x
  3. Step 3: Cross multiply
    1,394.97x = 1,924.64 × 805.55
  4. Step 4: Simplify right side
    1,394.97x = 1,550,380.86
  5. Step 5: Solve for x
    x = 1,550,380.86/1,394.97
  6. Step 6: Final answer
    x = 1,111.41

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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.