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Finding the Fourth Proportional to 697.56, 1,040.43 and 684.60

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Solution

The fourth proportional to 697.56, 1,040.43 and 684.60 is: 1,021.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.56 : 1,040.43 = 684.60 : x
  2. Step 2: Convert to fraction form
    697.56/1,040.43 = 684.60/x
  3. Step 3: Cross multiply
    697.56x = 1,040.43 × 684.60
  4. Step 4: Simplify right side
    697.56x = 712,278.38
  5. Step 5: Solve for x
    x = 712,278.38/697.56
  6. Step 6: Final answer
    x = 1,021.10

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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.