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Finding the Fourth Proportional to 261.69, 392.55 and 201.18

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Solution

The fourth proportional to 261.69, 392.55 and 201.18 is: 301.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.69 : 392.55 = 201.18 : x
  2. Step 2: Convert to fraction form
    261.69/392.55 = 201.18/x
  3. Step 3: Cross multiply
    261.69x = 392.55 × 201.18
  4. Step 4: Simplify right side
    261.69x = 78,973.21
  5. Step 5: Solve for x
    x = 78,973.21/261.69
  6. Step 6: Final answer
    x = 301.78

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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.