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Finding the Fourth Proportional to 356.70, 492.28 and 216.79

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Solution

The fourth proportional to 356.70, 492.28 and 216.79 is: 299.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.70 : 492.28 = 216.79 : x
  2. Step 2: Convert to fraction form
    356.70/492.28 = 216.79/x
  3. Step 3: Cross multiply
    356.70x = 492.28 × 216.79
  4. Step 4: Simplify right side
    356.70x = 106,718.92
  5. Step 5: Solve for x
    x = 106,718.92/356.70
  6. Step 6: Final answer
    x = 299.18

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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.