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Finding the Fourth Proportional to 139.58, 192.59 and 87.14

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Solution

The fourth proportional to 139.58, 192.59 and 87.14 is: 120.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.58 : 192.59 = 87.14 : x
  2. Step 2: Convert to fraction form
    139.58/192.59 = 87.14/x
  3. Step 3: Cross multiply
    139.58x = 192.59 × 87.14
  4. Step 4: Simplify right side
    139.58x = 16,780.89
  5. Step 5: Solve for x
    x = 16,780.89/139.58
  6. Step 6: Final answer
    x = 120.22

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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.