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Finding the Fourth Proportional to 417.78, 626.15 and 235.31

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Solution

The fourth proportional to 417.78, 626.15 and 235.31 is: 352.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.78 : 626.15 = 235.31 : x
  2. Step 2: Convert to fraction form
    417.78/626.15 = 235.31/x
  3. Step 3: Cross multiply
    417.78x = 626.15 × 235.31
  4. Step 4: Simplify right side
    417.78x = 147,335.05
  5. Step 5: Solve for x
    x = 147,335.05/417.78
  6. Step 6: Final answer
    x = 352.66

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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.