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Finding the Fourth Proportional to 697.26, 1,040.73 and 615.28

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Solution

The fourth proportional to 697.26, 1,040.73 and 615.28 is: 918.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.26 : 1,040.73 = 615.28 : x
  2. Step 2: Convert to fraction form
    697.26/1,040.73 = 615.28/x
  3. Step 3: Cross multiply
    697.26x = 1,040.73 × 615.28
  4. Step 4: Simplify right side
    697.26x = 640,340.35
  5. Step 5: Solve for x
    x = 640,340.35/697.26
  6. Step 6: Final answer
    x = 918.37

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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.