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Finding the Fourth Proportional to 261.89, 390.43 and 249.59

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Solution

The fourth proportional to 261.89, 390.43 and 249.59 is: 372.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.89 : 390.43 = 249.59 : x
  2. Step 2: Convert to fraction form
    261.89/390.43 = 249.59/x
  3. Step 3: Cross multiply
    261.89x = 390.43 × 249.59
  4. Step 4: Simplify right side
    261.89x = 97,447.42
  5. Step 5: Solve for x
    x = 97,447.42/261.89
  6. Step 6: Final answer
    x = 372.09

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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.