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Finding the Fourth Proportional to 393.81, 587.28 and 349.56

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Solution

The fourth proportional to 393.81, 587.28 and 349.56 is: 521.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.81 : 587.28 = 349.56 : x
  2. Step 2: Convert to fraction form
    393.81/587.28 = 349.56/x
  3. Step 3: Cross multiply
    393.81x = 587.28 × 349.56
  4. Step 4: Simplify right side
    393.81x = 205,284.91
  5. Step 5: Solve for x
    x = 205,284.91/393.81
  6. Step 6: Final answer
    x = 521.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.