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Finding the Fourth Proportional to 695.40, 959.86 and 400.88

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Solution

The fourth proportional to 695.40, 959.86 and 400.88 is: 553.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.40 : 959.86 = 400.88 : x
  2. Step 2: Convert to fraction form
    695.40/959.86 = 400.88/x
  3. Step 3: Cross multiply
    695.40x = 959.86 × 400.88
  4. Step 4: Simplify right side
    695.40x = 384,781.87
  5. Step 5: Solve for x
    x = 384,781.87/695.40
  6. Step 6: Final answer
    x = 553.32

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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.