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Finding the Fourth Proportional to 286.68, 430.28 and 187.76

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Solution

The fourth proportional to 286.68, 430.28 and 187.76 is: 281.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.68 : 430.28 = 187.76 : x
  2. Step 2: Convert to fraction form
    286.68/430.28 = 187.76/x
  3. Step 3: Cross multiply
    286.68x = 430.28 × 187.76
  4. Step 4: Simplify right side
    286.68x = 80,789.37
  5. Step 5: Solve for x
    x = 80,789.37/286.68
  6. Step 6: Final answer
    x = 281.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.