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Finding the Fourth Proportional to 640.68, 883.11 and 453.78

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Solution

The fourth proportional to 640.68, 883.11 and 453.78 is: 625.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.68 : 883.11 = 453.78 : x
  2. Step 2: Convert to fraction form
    640.68/883.11 = 453.78/x
  3. Step 3: Cross multiply
    640.68x = 883.11 × 453.78
  4. Step 4: Simplify right side
    640.68x = 400,737.66
  5. Step 5: Solve for x
    x = 400,737.66/640.68
  6. Step 6: Final answer
    x = 625.49

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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.