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Finding the Fourth Proportional to 134.58, 200.67 and 128.91

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Solution

The fourth proportional to 134.58, 200.67 and 128.91 is: 192.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.58 : 200.67 = 128.91 : x
  2. Step 2: Convert to fraction form
    134.58/200.67 = 128.91/x
  3. Step 3: Cross multiply
    134.58x = 200.67 × 128.91
  4. Step 4: Simplify right side
    134.58x = 25,868.37
  5. Step 5: Solve for x
    x = 25,868.37/134.58
  6. Step 6: Final answer
    x = 192.22

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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.