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Finding the Fourth Proportional to 695.80, 960.15 and 401.05

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Solution

The fourth proportional to 695.80, 960.15 and 401.05 is: 553.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.80 : 960.15 = 401.05 : x
  2. Step 2: Convert to fraction form
    695.80/960.15 = 401.05/x
  3. Step 3: Cross multiply
    695.80x = 960.15 × 401.05
  4. Step 4: Simplify right side
    695.80x = 385,068.16
  5. Step 5: Solve for x
    x = 385,068.16/695.80
  6. Step 6: Final answer
    x = 553.42

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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.