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Finding the Fourth Proportional to 457.04, 685.20 and 197.20

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Solution

The fourth proportional to 457.04, 685.20 and 197.20 is: 295.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.04 : 685.20 = 197.20 : x
  2. Step 2: Convert to fraction form
    457.04/685.20 = 197.20/x
  3. Step 3: Cross multiply
    457.04x = 685.20 × 197.20
  4. Step 4: Simplify right side
    457.04x = 135,121.44
  5. Step 5: Solve for x
    x = 135,121.44/457.04
  6. Step 6: Final answer
    x = 295.64

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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.