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Finding the Fourth Proportional to 258.70, 388.15 and 156.06

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Solution

The fourth proportional to 258.70, 388.15 and 156.06 is: 234.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.70 : 388.15 = 156.06 : x
  2. Step 2: Convert to fraction form
    258.70/388.15 = 156.06/x
  3. Step 3: Cross multiply
    258.70x = 388.15 × 156.06
  4. Step 4: Simplify right side
    258.70x = 60,572.75
  5. Step 5: Solve for x
    x = 60,572.75/258.70
  6. Step 6: Final answer
    x = 234.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.