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Finding the Fourth Proportional to 187.68, 258.84 and 121.30

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Solution

The fourth proportional to 187.68, 258.84 and 121.30 is: 167.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.68 : 258.84 = 121.30 : x
  2. Step 2: Convert to fraction form
    187.68/258.84 = 121.30/x
  3. Step 3: Cross multiply
    187.68x = 258.84 × 121.30
  4. Step 4: Simplify right side
    187.68x = 31,396.64
  5. Step 5: Solve for x
    x = 31,396.64/187.68
  6. Step 6: Final answer
    x = 167.28

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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.