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Finding the Fourth Proportional to 356.46, 491.85 and 216.60

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Solution

The fourth proportional to 356.46, 491.85 and 216.60 is: 298.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.46 : 491.85 = 216.60 : x
  2. Step 2: Convert to fraction form
    356.46/491.85 = 216.60/x
  3. Step 3: Cross multiply
    356.46x = 491.85 × 216.60
  4. Step 4: Simplify right side
    356.46x = 106,534.71
  5. Step 5: Solve for x
    x = 106,534.71/356.46
  6. Step 6: Final answer
    x = 298.87

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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.