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Finding the Fourth Proportional to 187.55, 258.64 and 122.03

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Solution

The fourth proportional to 187.55, 258.64 and 122.03 is: 168.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.55 : 258.64 = 122.03 : x
  2. Step 2: Convert to fraction form
    187.55/258.64 = 122.03/x
  3. Step 3: Cross multiply
    187.55x = 258.64 × 122.03
  4. Step 4: Simplify right side
    187.55x = 31,560.24
  5. Step 5: Solve for x
    x = 31,560.24/187.55
  6. Step 6: Final answer
    x = 168.28

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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.