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Finding the Fourth Proportional to 142.16, 196.20 and 100.64

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Solution

The fourth proportional to 142.16, 196.20 and 100.64 is: 138.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.16 : 196.20 = 100.64 : x
  2. Step 2: Convert to fraction form
    142.16/196.20 = 100.64/x
  3. Step 3: Cross multiply
    142.16x = 196.20 × 100.64
  4. Step 4: Simplify right side
    142.16x = 19,745.57
  5. Step 5: Solve for x
    x = 19,745.57/142.16
  6. Step 6: Final answer
    x = 138.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.