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Finding the Fourth Proportional to 695.50, 959.81 and 400.72

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Solution

The fourth proportional to 695.50, 959.81 and 400.72 is: 553.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.50 : 959.81 = 400.72 : x
  2. Step 2: Convert to fraction form
    695.50/959.81 = 400.72/x
  3. Step 3: Cross multiply
    695.50x = 959.81 × 400.72
  4. Step 4: Simplify right side
    695.50x = 384,615.06
  5. Step 5: Solve for x
    x = 384,615.06/695.50
  6. Step 6: Final answer
    x = 553.01

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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.