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Finding the Fourth Proportional to 695.45, 959.72 and 400.81

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Solution

The fourth proportional to 695.45, 959.72 and 400.81 is: 553.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.45 : 959.72 = 400.81 : x
  2. Step 2: Convert to fraction form
    695.45/959.72 = 400.81/x
  3. Step 3: Cross multiply
    695.45x = 959.72 × 400.81
  4. Step 4: Simplify right side
    695.45x = 384,665.37
  5. Step 5: Solve for x
    x = 384,665.37/695.45
  6. Step 6: Final answer
    x = 553.12

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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.