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Finding the Fourth Proportional to 417.78, 625.88 and 261.65

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Solution

The fourth proportional to 417.78, 625.88 and 261.65 is: 391.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.78 : 625.88 = 261.65 : x
  2. Step 2: Convert to fraction form
    417.78/625.88 = 261.65/x
  3. Step 3: Cross multiply
    417.78x = 625.88 × 261.65
  4. Step 4: Simplify right side
    417.78x = 163,757.06
  5. Step 5: Solve for x
    x = 163,757.06/417.78
  6. Step 6: Final answer
    x = 391.97

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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.