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Finding the Fourth Proportional to 261.11, 388.59 and 251.39

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Solution

The fourth proportional to 261.11, 388.59 and 251.39 is: 374.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.11 : 388.59 = 251.39 : x
  2. Step 2: Convert to fraction form
    261.11/388.59 = 251.39/x
  3. Step 3: Cross multiply
    261.11x = 388.59 × 251.39
  4. Step 4: Simplify right side
    261.11x = 97,687.64
  5. Step 5: Solve for x
    x = 97,687.64/261.11
  6. Step 6: Final answer
    x = 374.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.