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Finding the Fourth Proportional to 663.97, 995.36 and 429.07

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Solution

The fourth proportional to 663.97, 995.36 and 429.07 is: 643.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.97 : 995.36 = 429.07 : x
  2. Step 2: Convert to fraction form
    663.97/995.36 = 429.07/x
  3. Step 3: Cross multiply
    663.97x = 995.36 × 429.07
  4. Step 4: Simplify right side
    663.97x = 427,076.35
  5. Step 5: Solve for x
    x = 427,076.35/663.97
  6. Step 6: Final answer
    x = 643.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.