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Finding the Fourth Proportional to 663.42, 995.90 and 416.95

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Solution

The fourth proportional to 663.42, 995.90 and 416.95 is: 625.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.42 : 995.90 = 416.95 : x
  2. Step 2: Convert to fraction form
    663.42/995.90 = 416.95/x
  3. Step 3: Cross multiply
    663.42x = 995.90 × 416.95
  4. Step 4: Simplify right side
    663.42x = 415,235.93
  5. Step 5: Solve for x
    x = 415,235.93/663.42
  6. Step 6: Final answer
    x = 625.90

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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.