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Finding the Fourth Proportional to 663.55, 995.76 and 355.61

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Solution

The fourth proportional to 663.55, 995.76 and 355.61 is: 533.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.55 : 995.76 = 355.61 : x
  2. Step 2: Convert to fraction form
    663.55/995.76 = 355.61/x
  3. Step 3: Cross multiply
    663.55x = 995.76 × 355.61
  4. Step 4: Simplify right side
    663.55x = 354,104.70
  5. Step 5: Solve for x
    x = 354,104.70/663.55
  6. Step 6: Final answer
    x = 533.65

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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.