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Finding the Fourth Proportional to 358.30, 494.22 and 316.90

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Solution

The fourth proportional to 358.30, 494.22 and 316.90 is: 437.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.30 : 494.22 = 316.90 : x
  2. Step 2: Convert to fraction form
    358.30/494.22 = 316.90/x
  3. Step 3: Cross multiply
    358.30x = 494.22 × 316.90
  4. Step 4: Simplify right side
    358.30x = 156,618.32
  5. Step 5: Solve for x
    x = 156,618.32/358.30
  6. Step 6: Final answer
    x = 437.12

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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.