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Finding the Fourth Proportional to 142.08, 196.08 and 79.08

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Solution

The fourth proportional to 142.08, 196.08 and 79.08 is: 109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.08 : 196.08 = 79.08 : x
  2. Step 2: Convert to fraction form
    142.08/196.08 = 79.08/x
  3. Step 3: Cross multiply
    142.08x = 196.08 × 79.08
  4. Step 4: Simplify right side
    142.08x = 15,506.01
  5. Step 5: Solve for x
    x = 15,506.01/142.08
  6. Step 6: Final answer
    x = 109.14

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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.