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Finding the Fourth Proportional to 721.44, 1,076.40 and 693.36

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Solution

The fourth proportional to 721.44, 1,076.40 and 693.36 is: 1,034.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.44 : 1,076.40 = 693.36 : x
  2. Step 2: Convert to fraction form
    721.44/1,076.40 = 693.36/x
  3. Step 3: Cross multiply
    721.44x = 1,076.40 × 693.36
  4. Step 4: Simplify right side
    721.44x = 746,332.70
  5. Step 5: Solve for x
    x = 746,332.70/721.44
  6. Step 6: Final answer
    x = 1,034.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.