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Finding the Fourth Proportional to 261.78, 393.45 and 216.42

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Solution

The fourth proportional to 261.78, 393.45 and 216.42 is: 325.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.78 : 393.45 = 216.42 : x
  2. Step 2: Convert to fraction form
    261.78/393.45 = 216.42/x
  3. Step 3: Cross multiply
    261.78x = 393.45 × 216.42
  4. Step 4: Simplify right side
    261.78x = 85,150.45
  5. Step 5: Solve for x
    x = 85,150.45/261.78
  6. Step 6: Final answer
    x = 325.27

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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.