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Finding the Fourth Proportional to 640.64, 955.35 and 634.80

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Solution

The fourth proportional to 640.64, 955.35 and 634.80 is: 946.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.64 : 955.35 = 634.80 : x
  2. Step 2: Convert to fraction form
    640.64/955.35 = 634.80/x
  3. Step 3: Cross multiply
    640.64x = 955.35 × 634.80
  4. Step 4: Simplify right side
    640.64x = 606,456.18
  5. Step 5: Solve for x
    x = 606,456.18/640.64
  6. Step 6: Final answer
    x = 946.65

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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.