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Finding the Fourth Proportional to 261.96, 392.82 and 140.28

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Solution

The fourth proportional to 261.96, 392.82 and 140.28 is: 210.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.96 : 392.82 = 140.28 : x
  2. Step 2: Convert to fraction form
    261.96/392.82 = 140.28/x
  3. Step 3: Cross multiply
    261.96x = 392.82 × 140.28
  4. Step 4: Simplify right side
    261.96x = 55,104.79
  5. Step 5: Solve for x
    x = 55,104.79/261.96
  6. Step 6: Final answer
    x = 210.36

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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.