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Finding the Fourth Proportional to 143.10, 197.48 and 77.61

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Solution

The fourth proportional to 143.10, 197.48 and 77.61 is: 107.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.10 : 197.48 = 77.61 : x
  2. Step 2: Convert to fraction form
    143.10/197.48 = 77.61/x
  3. Step 3: Cross multiply
    143.10x = 197.48 × 77.61
  4. Step 4: Simplify right side
    143.10x = 15,326.12
  5. Step 5: Solve for x
    x = 15,326.12/143.10
  6. Step 6: Final answer
    x = 107.10

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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.