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Finding the Fourth Proportional to 976.74, 1,464.58 and 428.28

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Solution

The fourth proportional to 976.74, 1,464.58 and 428.28 is: 642.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.74 : 1,464.58 = 428.28 : x
  2. Step 2: Convert to fraction form
    976.74/1,464.58 = 428.28/x
  3. Step 3: Cross multiply
    976.74x = 1,464.58 × 428.28
  4. Step 4: Simplify right side
    976.74x = 627,250.32
  5. Step 5: Solve for x
    x = 627,250.32/976.74
  6. Step 6: Final answer
    x = 642.19

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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.