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Finding the Fourth Proportional to 697.87, 960.90 and 641.56

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Solution

The fourth proportional to 697.87, 960.90 and 641.56 is: 883.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.87 : 960.90 = 641.56 : x
  2. Step 2: Convert to fraction form
    697.87/960.90 = 641.56/x
  3. Step 3: Cross multiply
    697.87x = 960.90 × 641.56
  4. Step 4: Simplify right side
    697.87x = 616,475.00
  5. Step 5: Solve for x
    x = 616,475.00/697.87
  6. Step 6: Final answer
    x = 883.37

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1.5x scale

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.