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Finding the Fourth Proportional to 457.27, 685.83 and 128.23

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Solution

The fourth proportional to 457.27, 685.83 and 128.23 is: 192.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.27 : 685.83 = 128.23 : x
  2. Step 2: Convert to fraction form
    457.27/685.83 = 128.23/x
  3. Step 3: Cross multiply
    457.27x = 685.83 × 128.23
  4. Step 4: Simplify right side
    457.27x = 87,943.98
  5. Step 5: Solve for x
    x = 87,943.98/457.27
  6. Step 6: Final answer
    x = 192.32

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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.