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Finding the Fourth Proportional to 356.98, 534.66 and 218.20

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Solution

The fourth proportional to 356.98, 534.66 and 218.20 is: 326.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.98 : 534.66 = 218.20 : x
  2. Step 2: Convert to fraction form
    356.98/534.66 = 218.20/x
  3. Step 3: Cross multiply
    356.98x = 534.66 × 218.20
  4. Step 4: Simplify right side
    356.98x = 116,662.81
  5. Step 5: Solve for x
    x = 116,662.81/356.98
  6. Step 6: Final answer
    x = 326.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.