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Finding the Fourth Proportional to 722.97, 995.16 and 639.93

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Solution

The fourth proportional to 722.97, 995.16 and 639.93 is: 880.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.97 : 995.16 = 639.93 : x
  2. Step 2: Convert to fraction form
    722.97/995.16 = 639.93/x
  3. Step 3: Cross multiply
    722.97x = 995.16 × 639.93
  4. Step 4: Simplify right side
    722.97x = 636,832.74
  5. Step 5: Solve for x
    x = 636,832.74/722.97
  6. Step 6: Final answer
    x = 880.86

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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.