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Finding the Fourth Proportional to 139.41, 192.28 and 86.93

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Solution

The fourth proportional to 139.41, 192.28 and 86.93 is: 119.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.41 : 192.28 = 86.93 : x
  2. Step 2: Convert to fraction form
    139.41/192.28 = 86.93/x
  3. Step 3: Cross multiply
    139.41x = 192.28 × 86.93
  4. Step 4: Simplify right side
    139.41x = 16,714.90
  5. Step 5: Solve for x
    x = 16,714.90/139.41
  6. Step 6: Final answer
    x = 119.90

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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.