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Finding the Fourth Proportional to 356.28, 491.70 and 216.39

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Solution

The fourth proportional to 356.28, 491.70 and 216.39 is: 298.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.28 : 491.70 = 216.39 : x
  2. Step 2: Convert to fraction form
    356.28/491.70 = 216.39/x
  3. Step 3: Cross multiply
    356.28x = 491.70 × 216.39
  4. Step 4: Simplify right side
    356.28x = 106,398.96
  5. Step 5: Solve for x
    x = 106,398.96/356.28
  6. Step 6: Final answer
    x = 298.64

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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.