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Finding the Fourth Proportional to 976.12, 1,463.28 and 428.20

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Solution

The fourth proportional to 976.12, 1,463.28 and 428.20 is: 641.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.12 : 1,463.28 = 428.20 : x
  2. Step 2: Convert to fraction form
    976.12/1,463.28 = 428.20/x
  3. Step 3: Cross multiply
    976.12x = 1,463.28 × 428.20
  4. Step 4: Simplify right side
    976.12x = 626,576.50
  5. Step 5: Solve for x
    x = 626,576.50/976.12
  6. Step 6: Final answer
    x = 641.91

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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.