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Finding the Fourth Proportional to 187.26, 258.12 and 156.12

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Solution

The fourth proportional to 187.26, 258.12 and 156.12 is: 215.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.26 : 258.12 = 156.12 : x
  2. Step 2: Convert to fraction form
    187.26/258.12 = 156.12/x
  3. Step 3: Cross multiply
    187.26x = 258.12 × 156.12
  4. Step 4: Simplify right side
    187.26x = 40,297.69
  5. Step 5: Solve for x
    x = 40,297.69/187.26
  6. Step 6: Final answer
    x = 215.20

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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.