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Finding the Fourth Proportional to 133.90, 201.69 and 123.87

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Solution

The fourth proportional to 133.90, 201.69 and 123.87 is: 186.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.90 : 201.69 = 123.87 : x
  2. Step 2: Convert to fraction form
    133.90/201.69 = 123.87/x
  3. Step 3: Cross multiply
    133.90x = 201.69 × 123.87
  4. Step 4: Simplify right side
    133.90x = 24,983.34
  5. Step 5: Solve for x
    x = 24,983.34/133.90
  6. Step 6: Final answer
    x = 186.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.