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Finding the Fourth Proportional to 286.30, 428.61 and 177.76

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Solution

The fourth proportional to 286.30, 428.61 and 177.76 is: 266.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.30 : 428.61 = 177.76 : x
  2. Step 2: Convert to fraction form
    286.30/428.61 = 177.76/x
  3. Step 3: Cross multiply
    286.30x = 428.61 × 177.76
  4. Step 4: Simplify right side
    286.30x = 76,189.71
  5. Step 5: Solve for x
    x = 76,189.71/286.30
  6. Step 6: Final answer
    x = 266.12

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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.