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Finding the Fourth Proportional to 188.72, 260.18 and 138.77

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Solution

The fourth proportional to 188.72, 260.18 and 138.77 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.72 : 260.18 = 138.77 : x
  2. Step 2: Convert to fraction form
    188.72/260.18 = 138.77/x
  3. Step 3: Cross multiply
    188.72x = 260.18 × 138.77
  4. Step 4: Simplify right side
    188.72x = 36,105.18
  5. Step 5: Solve for x
    x = 36,105.18/188.72
  6. Step 6: Final answer
    x = 191.32

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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.