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Finding the Fourth Proportional to 694.88, 960.76 and 664.28

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Solution

The fourth proportional to 694.88, 960.76 and 664.28 is: 918.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.88 : 960.76 = 664.28 : x
  2. Step 2: Convert to fraction form
    694.88/960.76 = 664.28/x
  3. Step 3: Cross multiply
    694.88x = 960.76 × 664.28
  4. Step 4: Simplify right side
    694.88x = 638,213.65
  5. Step 5: Solve for x
    x = 638,213.65/694.88
  6. Step 6: Final answer
    x = 918.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.