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Finding the Fourth Proportional to 188.70, 260.40 and 105.78

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Solution

The fourth proportional to 188.70, 260.40 and 105.78 is: 145.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.70 : 260.40 = 105.78 : x
  2. Step 2: Convert to fraction form
    188.70/260.40 = 105.78/x
  3. Step 3: Cross multiply
    188.70x = 260.40 × 105.78
  4. Step 4: Simplify right side
    188.70x = 27,545.11
  5. Step 5: Solve for x
    x = 27,545.11/188.70
  6. Step 6: Final answer
    x = 145.97

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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.