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Finding the Fourth Proportional to 258.68, 356.68 and 245

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Solution

The fourth proportional to 258.68, 356.68 and 245 is: 337.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.68 : 356.68 = 245 : x
  2. Step 2: Convert to fraction form
    258.68/356.68 = 245/x
  3. Step 3: Cross multiply
    258.68x = 356.68 × 245
  4. Step 4: Simplify right side
    258.68x = 87,386.60
  5. Step 5: Solve for x
    x = 87,386.60/258.68
  6. Step 6: Final answer
    x = 337.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.