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Finding the Fourth Proportional to 758.94, 1,138.28 and 210.97

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Solution

The fourth proportional to 758.94, 1,138.28 and 210.97 is: 316.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.94 : 1,138.28 = 210.97 : x
  2. Step 2: Convert to fraction form
    758.94/1,138.28 = 210.97/x
  3. Step 3: Cross multiply
    758.94x = 1,138.28 × 210.97
  4. Step 4: Simplify right side
    758.94x = 240,144.72
  5. Step 5: Solve for x
    x = 240,144.72/758.94
  6. Step 6: Final answer
    x = 316.42

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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.