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Finding the Fourth Proportional to 187.80, 259.23 and 128.82

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Solution

The fourth proportional to 187.80, 259.23 and 128.82 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.80 : 259.23 = 128.82 : x
  2. Step 2: Convert to fraction form
    187.80/259.23 = 128.82/x
  3. Step 3: Cross multiply
    187.80x = 259.23 × 128.82
  4. Step 4: Simplify right side
    187.80x = 33,394.01
  5. Step 5: Solve for x
    x = 33,394.01/187.80
  6. Step 6: Final answer
    x = 177.82

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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.