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Finding the Fourth Proportional to 697.56, 1,047.27 and 640.26

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Solution

The fourth proportional to 697.56, 1,047.27 and 640.26 is: 961.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.56 : 1,047.27 = 640.26 : x
  2. Step 2: Convert to fraction form
    697.56/1,047.27 = 640.26/x
  3. Step 3: Cross multiply
    697.56x = 1,047.27 × 640.26
  4. Step 4: Simplify right side
    697.56x = 670,525.09
  5. Step 5: Solve for x
    x = 670,525.09/697.56
  6. Step 6: Final answer
    x = 961.24

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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.