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Finding the Fourth Proportional to 663.75, 993.60 and 432.90

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Solution

The fourth proportional to 663.75, 993.60 and 432.90 is: 648.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.75 : 993.60 = 432.90 : x
  2. Step 2: Convert to fraction form
    663.75/993.60 = 432.90/x
  3. Step 3: Cross multiply
    663.75x = 993.60 × 432.90
  4. Step 4: Simplify right side
    663.75x = 430,129.44
  5. Step 5: Solve for x
    x = 430,129.44/663.75
  6. Step 6: Final answer
    x = 648.03

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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.