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Finding the Fourth Proportional to 265.87, 396.59 and 261.61

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Solution

The fourth proportional to 265.87, 396.59 and 261.61 is: 390.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.87 : 396.59 = 261.61 : x
  2. Step 2: Convert to fraction form
    265.87/396.59 = 261.61/x
  3. Step 3: Cross multiply
    265.87x = 396.59 × 261.61
  4. Step 4: Simplify right side
    265.87x = 103,752.58
  5. Step 5: Solve for x
    x = 103,752.58/265.87
  6. Step 6: Final answer
    x = 390.24

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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.