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Finding the Fourth Proportional to 695.38, 961.45 and 664.78

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Solution

The fourth proportional to 695.38, 961.45 and 664.78 is: 919.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.38 : 961.45 = 664.78 : x
  2. Step 2: Convert to fraction form
    695.38/961.45 = 664.78/x
  3. Step 3: Cross multiply
    695.38x = 961.45 × 664.78
  4. Step 4: Simplify right side
    695.38x = 639,152.73
  5. Step 5: Solve for x
    x = 639,152.73/695.38
  6. Step 6: Final answer
    x = 919.14

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Double scale
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1.5x scale

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.