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Finding the Fourth Proportional to 356.34, 491.78 and 216.47

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Solution

The fourth proportional to 356.34, 491.78 and 216.47 is: 298.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.34 : 491.78 = 216.47 : x
  2. Step 2: Convert to fraction form
    356.34/491.78 = 216.47/x
  3. Step 3: Cross multiply
    356.34x = 491.78 × 216.47
  4. Step 4: Simplify right side
    356.34x = 106,452.08
  5. Step 5: Solve for x
    x = 106,452.08/356.34
  6. Step 6: Final answer
    x = 298.74

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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.