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Finding the Fourth Proportional to 696.87, 959.52 and 640.56

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Solution

The fourth proportional to 696.87, 959.52 and 640.56 is: 881.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.87 : 959.52 = 640.56 : x
  2. Step 2: Convert to fraction form
    696.87/959.52 = 640.56/x
  3. Step 3: Cross multiply
    696.87x = 959.52 × 640.56
  4. Step 4: Simplify right side
    696.87x = 614,630.13
  5. Step 5: Solve for x
    x = 614,630.13/696.87
  6. Step 6: Final answer
    x = 881.99

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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.