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Finding the Fourth Proportional to 261.62, 390.39 and 234.35

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Solution

The fourth proportional to 261.62, 390.39 and 234.35 is: 349.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.62 : 390.39 = 234.35 : x
  2. Step 2: Convert to fraction form
    261.62/390.39 = 234.35/x
  3. Step 3: Cross multiply
    261.62x = 390.39 × 234.35
  4. Step 4: Simplify right side
    261.62x = 91,486.72
  5. Step 5: Solve for x
    x = 91,486.72/261.62
  6. Step 6: Final answer
    x = 349.69

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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.