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Finding the Fourth Proportional to 258.75, 356.94 and 153.90

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Solution

The fourth proportional to 258.75, 356.94 and 153.90 is: 212.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.75 : 356.94 = 153.90 : x
  2. Step 2: Convert to fraction form
    258.75/356.94 = 153.90/x
  3. Step 3: Cross multiply
    258.75x = 356.94 × 153.90
  4. Step 4: Simplify right side
    258.75x = 54,933.07
  5. Step 5: Solve for x
    x = 54,933.07/258.75
  6. Step 6: Final answer
    x = 212.30

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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.