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Finding the Fourth Proportional to 358.30, 494.40 and 218.53

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Solution

The fourth proportional to 358.30, 494.40 and 218.53 is: 301.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.30 : 494.40 = 218.53 : x
  2. Step 2: Convert to fraction form
    358.30/494.40 = 218.53/x
  3. Step 3: Cross multiply
    358.30x = 494.40 × 218.53
  4. Step 4: Simplify right side
    358.30x = 108,041.23
  5. Step 5: Solve for x
    x = 108,041.23/358.30
  6. Step 6: Final answer
    x = 301.54

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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.