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Finding the Fourth Proportional to 134.90, 201.92 and 85.98

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Solution

The fourth proportional to 134.90, 201.92 and 85.98 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.90 : 201.92 = 85.98 : x
  2. Step 2: Convert to fraction form
    134.90/201.92 = 85.98/x
  3. Step 3: Cross multiply
    134.90x = 201.92 × 85.98
  4. Step 4: Simplify right side
    134.90x = 17,361.08
  5. Step 5: Solve for x
    x = 17,361.08/134.90
  6. Step 6: Final answer
    x = 128.70

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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.