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Finding the Fourth Proportional to 312.61, 468.34 and 261.58

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Solution

The fourth proportional to 312.61, 468.34 and 261.58 is: 391.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.61 : 468.34 = 261.58 : x
  2. Step 2: Convert to fraction form
    312.61/468.34 = 261.58/x
  3. Step 3: Cross multiply
    312.61x = 468.34 × 261.58
  4. Step 4: Simplify right side
    312.61x = 122,508.38
  5. Step 5: Solve for x
    x = 122,508.38/312.61
  6. Step 6: Final answer
    x = 391.89

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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.