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Finding the Fourth Proportional to 142.23, 197.16 and 139.70

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Solution

The fourth proportional to 142.23, 197.16 and 139.70 is: 193.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.23 : 197.16 = 139.70 : x
  2. Step 2: Convert to fraction form
    142.23/197.16 = 139.70/x
  3. Step 3: Cross multiply
    142.23x = 197.16 × 139.70
  4. Step 4: Simplify right side
    142.23x = 27,543.25
  5. Step 5: Solve for x
    x = 27,543.25/142.23
  6. Step 6: Final answer
    x = 193.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.