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Finding the Fourth Proportional to 697.78, 1,043.97 and 480.70

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Solution

The fourth proportional to 697.78, 1,043.97 and 480.70 is: 719.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.78 : 1,043.97 = 480.70 : x
  2. Step 2: Convert to fraction form
    697.78/1,043.97 = 480.70/x
  3. Step 3: Cross multiply
    697.78x = 1,043.97 × 480.70
  4. Step 4: Simplify right side
    697.78x = 501,836.38
  5. Step 5: Solve for x
    x = 501,836.38/697.78
  6. Step 6: Final answer
    x = 719.19

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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.