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Finding the Fourth Proportional to 358.47, 494.28 and 311.42

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Solution

The fourth proportional to 358.47, 494.28 and 311.42 is: 429.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.47 : 494.28 = 311.42 : x
  2. Step 2: Convert to fraction form
    358.47/494.28 = 311.42/x
  3. Step 3: Cross multiply
    358.47x = 494.28 × 311.42
  4. Step 4: Simplify right side
    358.47x = 153,929.91
  5. Step 5: Solve for x
    x = 153,929.91/358.47
  6. Step 6: Final answer
    x = 429.41

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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.