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Finding the Fourth Proportional to 142.86, 197.08 and 84.61

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Solution

The fourth proportional to 142.86, 197.08 and 84.61 is: 116.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.86 : 197.08 = 84.61 : x
  2. Step 2: Convert to fraction form
    142.86/197.08 = 84.61/x
  3. Step 3: Cross multiply
    142.86x = 197.08 × 84.61
  4. Step 4: Simplify right side
    142.86x = 16,674.94
  5. Step 5: Solve for x
    x = 16,674.94/142.86
  6. Step 6: Final answer
    x = 116.72

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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.