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Finding the Fourth Proportional to 187.69, 258.98 and 104.80

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Solution

The fourth proportional to 187.69, 258.98 and 104.80 is: 144.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.69 : 258.98 = 104.80 : x
  2. Step 2: Convert to fraction form
    187.69/258.98 = 104.80/x
  3. Step 3: Cross multiply
    187.69x = 258.98 × 104.80
  4. Step 4: Simplify right side
    187.69x = 27,140.17
  5. Step 5: Solve for x
    x = 27,140.17/187.69
  6. Step 6: Final answer
    x = 144.60

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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.