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Finding the Fourth Proportional to 265.39, 397.24 and 261.74

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Solution

The fourth proportional to 265.39, 397.24 and 261.74 is: 391.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.39 : 397.24 = 261.74 : x
  2. Step 2: Convert to fraction form
    265.39/397.24 = 261.74/x
  3. Step 3: Cross multiply
    265.39x = 397.24 × 261.74
  4. Step 4: Simplify right side
    265.39x = 103,973.94
  5. Step 5: Solve for x
    x = 103,973.94/265.39
  6. Step 6: Final answer
    x = 391.78

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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.