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Finding the Fourth Proportional to 1,004.92, 1,393.21 and 969.28

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Solution

The fourth proportional to 1,004.92, 1,393.21 and 969.28 is: 1,343.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.92 : 1,393.21 = 969.28 : x
  2. Step 2: Convert to fraction form
    1,004.92/1,393.21 = 969.28/x
  3. Step 3: Cross multiply
    1,004.92x = 1,393.21 × 969.28
  4. Step 4: Simplify right side
    1,004.92x = 1,350,410.59
  5. Step 5: Solve for x
    x = 1,350,410.59/1,004.92
  6. Step 6: Final answer
    x = 1,343.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.