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Finding the Fourth Proportional to 126.64, 190.02 and 85.53

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Solution

The fourth proportional to 126.64, 190.02 and 85.53 is: 128.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.64 : 190.02 = 85.53 : x
  2. Step 2: Convert to fraction form
    126.64/190.02 = 85.53/x
  3. Step 3: Cross multiply
    126.64x = 190.02 × 85.53
  4. Step 4: Simplify right side
    126.64x = 16,252.38
  5. Step 5: Solve for x
    x = 16,252.38/126.64
  6. Step 6: Final answer
    x = 128.34

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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.