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Finding the Fourth Proportional to 258.18, 356.26 and 153.28

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Solution

The fourth proportional to 258.18, 356.26 and 153.28 is: 211.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.18 : 356.26 = 153.28 : x
  2. Step 2: Convert to fraction form
    258.18/356.26 = 153.28/x
  3. Step 3: Cross multiply
    258.18x = 356.26 × 153.28
  4. Step 4: Simplify right side
    258.18x = 54,607.53
  5. Step 5: Solve for x
    x = 54,607.53/258.18
  6. Step 6: Final answer
    x = 211.51

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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.