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Finding the Fourth Proportional to 640.05, 955.77 and 636.21

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Solution

The fourth proportional to 640.05, 955.77 and 636.21 is: 950.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.05 : 955.77 = 636.21 : x
  2. Step 2: Convert to fraction form
    640.05/955.77 = 636.21/x
  3. Step 3: Cross multiply
    640.05x = 955.77 × 636.21
  4. Step 4: Simplify right side
    640.05x = 608,070.43
  5. Step 5: Solve for x
    x = 608,070.43/640.05
  6. Step 6: Final answer
    x = 950.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.