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Finding the Fourth Proportional to 356.68, 491.92 and 216.80

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Solution

The fourth proportional to 356.68, 491.92 and 216.80 is: 299.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.68 : 491.92 = 216.80 : x
  2. Step 2: Convert to fraction form
    356.68/491.92 = 216.80/x
  3. Step 3: Cross multiply
    356.68x = 491.92 × 216.80
  4. Step 4: Simplify right side
    356.68x = 106,648.26
  5. Step 5: Solve for x
    x = 106,648.26/356.68
  6. Step 6: Final answer
    x = 299.00

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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.