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Finding the Fourth Proportional to 356.42, 491.90 and 216.56

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Solution

The fourth proportional to 356.42, 491.90 and 216.56 is: 298.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.42 : 491.90 = 216.56 : x
  2. Step 2: Convert to fraction form
    356.42/491.90 = 216.56/x
  3. Step 3: Cross multiply
    356.42x = 491.90 × 216.56
  4. Step 4: Simplify right side
    356.42x = 106,525.86
  5. Step 5: Solve for x
    x = 106,525.86/356.42
  6. Step 6: Final answer
    x = 298.88

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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.