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Finding the Fourth Proportional to 187.17, 258.30 and 109.55

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Solution

The fourth proportional to 187.17, 258.30 and 109.55 is: 151.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.17 : 258.30 = 109.55 : x
  2. Step 2: Convert to fraction form
    187.17/258.30 = 109.55/x
  3. Step 3: Cross multiply
    187.17x = 258.30 × 109.55
  4. Step 4: Simplify right side
    187.17x = 28,295.96
  5. Step 5: Solve for x
    x = 28,295.96/187.17
  6. Step 6: Final answer
    x = 151.18

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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.