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Finding the Fourth Proportional to 261.33, 390.87 and 163.59

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Solution

The fourth proportional to 261.33, 390.87 and 163.59 is: 244.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.33 : 390.87 = 163.59 : x
  2. Step 2: Convert to fraction form
    261.33/390.87 = 163.59/x
  3. Step 3: Cross multiply
    261.33x = 390.87 × 163.59
  4. Step 4: Simplify right side
    261.33x = 63,942.42
  5. Step 5: Solve for x
    x = 63,942.42/261.33
  6. Step 6: Final answer
    x = 244.68

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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.