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Finding the Fourth Proportional to 187.01, 257.99 and 120.61

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Solution

The fourth proportional to 187.01, 257.99 and 120.61 is: 166.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.01 : 257.99 = 120.61 : x
  2. Step 2: Convert to fraction form
    187.01/257.99 = 120.61/x
  3. Step 3: Cross multiply
    187.01x = 257.99 × 120.61
  4. Step 4: Simplify right side
    187.01x = 31,115.83
  5. Step 5: Solve for x
    x = 31,115.83/187.01
  6. Step 6: Final answer
    x = 166.39

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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.