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Finding the Fourth Proportional to 258.30, 385.45 and 235.31

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Solution

The fourth proportional to 258.30, 385.45 and 235.31 is: 351.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.30 : 385.45 = 235.31 : x
  2. Step 2: Convert to fraction form
    258.30/385.45 = 235.31/x
  3. Step 3: Cross multiply
    258.30x = 385.45 × 235.31
  4. Step 4: Simplify right side
    258.30x = 90,697.72
  5. Step 5: Solve for x
    x = 90,697.72/258.30
  6. Step 6: Final answer
    x = 351.13

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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.