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Finding the Fourth Proportional to 187.79, 258.69 and 154.37

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Solution

The fourth proportional to 187.79, 258.69 and 154.37 is: 212.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.79 : 258.69 = 154.37 : x
  2. Step 2: Convert to fraction form
    187.79/258.69 = 154.37/x
  3. Step 3: Cross multiply
    187.79x = 258.69 × 154.37
  4. Step 4: Simplify right side
    187.79x = 39,935.20
  5. Step 5: Solve for x
    x = 39,935.20/187.79
  6. Step 6: Final answer
    x = 212.66

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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.