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Finding the Fourth Proportional to 976.20, 1,464.30 and 938.40

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Solution

The fourth proportional to 976.20, 1,464.30 and 938.40 is: 1,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.20 : 1,464.30 = 938.40 : x
  2. Step 2: Convert to fraction form
    976.20/1,464.30 = 938.40/x
  3. Step 3: Cross multiply
    976.20x = 1,464.30 × 938.40
  4. Step 4: Simplify right side
    976.20x = 1,374,099.12
  5. Step 5: Solve for x
    x = 1,374,099.12/976.20
  6. Step 6: Final answer
    x = 1,407.60

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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.