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Finding the Fourth Proportional to 136.56, 203.59 and 128.80

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Solution

The fourth proportional to 136.56, 203.59 and 128.80 is: 192.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.56 : 203.59 = 128.80 : x
  2. Step 2: Convert to fraction form
    136.56/203.59 = 128.80/x
  3. Step 3: Cross multiply
    136.56x = 203.59 × 128.80
  4. Step 4: Simplify right side
    136.56x = 26,222.81
  5. Step 5: Solve for x
    x = 26,222.81/136.56
  6. Step 6: Final answer
    x = 192.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.