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Finding the Fourth Proportional to 188.56, 260.16 and 136.72

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Solution

The fourth proportional to 188.56, 260.16 and 136.72 is: 188.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.56 : 260.16 = 136.72 : x
  2. Step 2: Convert to fraction form
    188.56/260.16 = 136.72/x
  3. Step 3: Cross multiply
    188.56x = 260.16 × 136.72
  4. Step 4: Simplify right side
    188.56x = 35,569.08
  5. Step 5: Solve for x
    x = 35,569.08/188.56
  6. Step 6: Final answer
    x = 188.64

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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.