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Finding the Fourth Proportional to 180.50, 270.35 and 128.98

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Solution

The fourth proportional to 180.50, 270.35 and 128.98 is: 193.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.50 : 270.35 = 128.98 : x
  2. Step 2: Convert to fraction form
    180.50/270.35 = 128.98/x
  3. Step 3: Cross multiply
    180.50x = 270.35 × 128.98
  4. Step 4: Simplify right side
    180.50x = 34,869.72
  5. Step 5: Solve for x
    x = 34,869.72/180.50
  6. Step 6: Final answer
    x = 193.18

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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.