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Finding the Fourth Proportional to 978.92, 1,350.99 and 769.47

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Solution

The fourth proportional to 978.92, 1,350.99 and 769.47 is: 1,061.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.92 : 1,350.99 = 769.47 : x
  2. Step 2: Convert to fraction form
    978.92/1,350.99 = 769.47/x
  3. Step 3: Cross multiply
    978.92x = 1,350.99 × 769.47
  4. Step 4: Simplify right side
    978.92x = 1,039,546.28
  5. Step 5: Solve for x
    x = 1,039,546.28/978.92
  6. Step 6: Final answer
    x = 1,061.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.