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Finding the Fourth Proportional to 275.78, 414.21 and 258.50

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Solution

The fourth proportional to 275.78, 414.21 and 258.50 is: 388.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.78 : 414.21 = 258.50 : x
  2. Step 2: Convert to fraction form
    275.78/414.21 = 258.50/x
  3. Step 3: Cross multiply
    275.78x = 414.21 × 258.50
  4. Step 4: Simplify right side
    275.78x = 107,073.29
  5. Step 5: Solve for x
    x = 107,073.29/275.78
  6. Step 6: Final answer
    x = 388.26

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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.