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Finding the Fourth Proportional to 978.32, 1,469.22 and 939.17

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Solution

The fourth proportional to 978.32, 1,469.22 and 939.17 is: 1,410.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.32 : 1,469.22 = 939.17 : x
  2. Step 2: Convert to fraction form
    978.32/1,469.22 = 939.17/x
  3. Step 3: Cross multiply
    978.32x = 1,469.22 × 939.17
  4. Step 4: Simplify right side
    978.32x = 1,379,847.35
  5. Step 5: Solve for x
    x = 1,379,847.35/978.32
  6. Step 6: Final answer
    x = 1,410.43

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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.