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Finding the Fourth Proportional to 358.78, 494.98 and 211.36

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Solution

The fourth proportional to 358.78, 494.98 and 211.36 is: 291.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.78 : 494.98 = 211.36 : x
  2. Step 2: Convert to fraction form
    358.78/494.98 = 211.36/x
  3. Step 3: Cross multiply
    358.78x = 494.98 × 211.36
  4. Step 4: Simplify right side
    358.78x = 104,618.97
  5. Step 5: Solve for x
    x = 104,618.97/358.78
  6. Step 6: Final answer
    x = 291.60

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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.