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Finding the Fourth Proportional to 881.56, 1,322.79 and 640.07

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Solution

The fourth proportional to 881.56, 1,322.79 and 640.07 is: 960.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.56 : 1,322.79 = 640.07 : x
  2. Step 2: Convert to fraction form
    881.56/1,322.79 = 640.07/x
  3. Step 3: Cross multiply
    881.56x = 1,322.79 × 640.07
  4. Step 4: Simplify right side
    881.56x = 846,678.20
  5. Step 5: Solve for x
    x = 846,678.20/881.56
  6. Step 6: Final answer
    x = 960.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.