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Finding the Fourth Proportional to 139.42, 192.38 and 86.98

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Solution

The fourth proportional to 139.42, 192.38 and 86.98 is: 120.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.42 : 192.38 = 86.98 : x
  2. Step 2: Convert to fraction form
    139.42/192.38 = 86.98/x
  3. Step 3: Cross multiply
    139.42x = 192.38 × 86.98
  4. Step 4: Simplify right side
    139.42x = 16,733.21
  5. Step 5: Solve for x
    x = 16,733.21/139.42
  6. Step 6: Final answer
    x = 120.02

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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.