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Finding the Fourth Proportional to 187.20, 258.32 and 113.49

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Solution

The fourth proportional to 187.20, 258.32 and 113.49 is: 156.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.20 : 258.32 = 113.49 : x
  2. Step 2: Convert to fraction form
    187.20/258.32 = 113.49/x
  3. Step 3: Cross multiply
    187.20x = 258.32 × 113.49
  4. Step 4: Simplify right side
    187.20x = 29,317.02
  5. Step 5: Solve for x
    x = 29,317.02/187.20
  6. Step 6: Final answer
    x = 156.61

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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.