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Finding the Fourth Proportional to 139.78, 193.05 and 88.06

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Solution

The fourth proportional to 139.78, 193.05 and 88.06 is: 121.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.78 : 193.05 = 88.06 : x
  2. Step 2: Convert to fraction form
    139.78/193.05 = 88.06/x
  3. Step 3: Cross multiply
    139.78x = 193.05 × 88.06
  4. Step 4: Simplify right side
    139.78x = 16,999.98
  5. Step 5: Solve for x
    x = 16,999.98/139.78
  6. Step 6: Final answer
    x = 121.62

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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.