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Finding the Fourth Proportional to 640.58, 884.66 and 636.93

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Solution

The fourth proportional to 640.58, 884.66 and 636.93 is: 879.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.58 : 884.66 = 636.93 : x
  2. Step 2: Convert to fraction form
    640.58/884.66 = 636.93/x
  3. Step 3: Cross multiply
    640.58x = 884.66 × 636.93
  4. Step 4: Simplify right side
    640.58x = 563,463.31
  5. Step 5: Solve for x
    x = 563,463.31/640.58
  6. Step 6: Final answer
    x = 879.62

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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.