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Finding the Fourth Proportional to 348.50, 521.78 and 261.87

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Solution

The fourth proportional to 348.50, 521.78 and 261.87 is: 392.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.50 : 521.78 = 261.87 : x
  2. Step 2: Convert to fraction form
    348.50/521.78 = 261.87/x
  3. Step 3: Cross multiply
    348.50x = 521.78 × 261.87
  4. Step 4: Simplify right side
    348.50x = 136,635.26
  5. Step 5: Solve for x
    x = 136,635.26/348.50
  6. Step 6: Final answer
    x = 392.06

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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.