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Finding the Fourth Proportional to 188.57, 260.20 and 105.67

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Solution

The fourth proportional to 188.57, 260.20 and 105.67 is: 145.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.57 : 260.20 = 105.67 : x
  2. Step 2: Convert to fraction form
    188.57/260.20 = 105.67/x
  3. Step 3: Cross multiply
    188.57x = 260.20 × 105.67
  4. Step 4: Simplify right side
    188.57x = 27,494.42
  5. Step 5: Solve for x
    x = 27,494.42/188.57
  6. Step 6: Final answer
    x = 145.80

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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.