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Finding the Fourth Proportional to 171.03, 256.54 and 128.23

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Solution

The fourth proportional to 171.03, 256.54 and 128.23 is: 192.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.03 : 256.54 = 128.23 : x
  2. Step 2: Convert to fraction form
    171.03/256.54 = 128.23/x
  3. Step 3: Cross multiply
    171.03x = 256.54 × 128.23
  4. Step 4: Simplify right side
    171.03x = 32,895.80
  5. Step 5: Solve for x
    x = 32,895.80/171.03
  6. Step 6: Final answer
    x = 192.35

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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.