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Finding the Fourth Proportional to 1,392.30, 1,921.05 and 867.96

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Solution

The fourth proportional to 1,392.30, 1,921.05 and 867.96 is: 1,197.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.30 : 1,921.05 = 867.96 : x
  2. Step 2: Convert to fraction form
    1,392.30/1,921.05 = 867.96/x
  3. Step 3: Cross multiply
    1,392.30x = 1,921.05 × 867.96
  4. Step 4: Simplify right side
    1,392.30x = 1,667,394.56
  5. Step 5: Solve for x
    x = 1,667,394.56/1,392.30
  6. Step 6: Final answer
    x = 1,197.58

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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.