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Finding the Fourth Proportional to 378.81, 567.81 and 216.15

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Solution

The fourth proportional to 378.81, 567.81 and 216.15 is: 323.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.81 : 567.81 = 216.15 : x
  2. Step 2: Convert to fraction form
    378.81/567.81 = 216.15/x
  3. Step 3: Cross multiply
    378.81x = 567.81 × 216.15
  4. Step 4: Simplify right side
    378.81x = 122,732.13
  5. Step 5: Solve for x
    x = 122,732.13/378.81
  6. Step 6: Final answer
    x = 323.99

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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.