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Finding the Fourth Proportional to 207.76, 286.72 and 115.76

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Solution

The fourth proportional to 207.76, 286.72 and 115.76 is: 159.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.76 : 286.72 = 115.76 : x
  2. Step 2: Convert to fraction form
    207.76/286.72 = 115.76/x
  3. Step 3: Cross multiply
    207.76x = 286.72 × 115.76
  4. Step 4: Simplify right side
    207.76x = 33,190.71
  5. Step 5: Solve for x
    x = 33,190.71/207.76
  6. Step 6: Final answer
    x = 159.76

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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.