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Finding the Fourth Proportional to 258.35, 356.47 and 153.47

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Solution

The fourth proportional to 258.35, 356.47 and 153.47 is: 211.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.35 : 356.47 = 153.47 : x
  2. Step 2: Convert to fraction form
    258.35/356.47 = 153.47/x
  3. Step 3: Cross multiply
    258.35x = 356.47 × 153.47
  4. Step 4: Simplify right side
    258.35x = 54,707.57
  5. Step 5: Solve for x
    x = 54,707.57/258.35
  6. Step 6: Final answer
    x = 211.76

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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.