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Finding the Fourth Proportional to 139.21, 192.30 and 118.71

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Solution

The fourth proportional to 139.21, 192.30 and 118.71 is: 163.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.21 : 192.30 = 118.71 : x
  2. Step 2: Convert to fraction form
    139.21/192.30 = 118.71/x
  3. Step 3: Cross multiply
    139.21x = 192.30 × 118.71
  4. Step 4: Simplify right side
    139.21x = 22,827.93
  5. Step 5: Solve for x
    x = 22,827.93/139.21
  6. Step 6: Final answer
    x = 163.98

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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.