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Finding the Fourth Proportional to 976.07, 1,464.24 and 428.24

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Solution

The fourth proportional to 976.07, 1,464.24 and 428.24 is: 642.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.07 : 1,464.24 = 428.24 : x
  2. Step 2: Convert to fraction form
    976.07/1,464.24 = 428.24/x
  3. Step 3: Cross multiply
    976.07x = 1,464.24 × 428.24
  4. Step 4: Simplify right side
    976.07x = 627,046.14
  5. Step 5: Solve for x
    x = 627,046.14/976.07
  6. Step 6: Final answer
    x = 642.42

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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.