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Finding the Fourth Proportional to 136.53, 203.93 and 128.63

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Solution

The fourth proportional to 136.53, 203.93 and 128.63 is: 192.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.53 : 203.93 = 128.63 : x
  2. Step 2: Convert to fraction form
    136.53/203.93 = 128.63/x
  3. Step 3: Cross multiply
    136.53x = 203.93 × 128.63
  4. Step 4: Simplify right side
    136.53x = 26,232.03
  5. Step 5: Solve for x
    x = 26,232.03/136.53
  6. Step 6: Final answer
    x = 192.13

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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.