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Finding the Fourth Proportional to 139.07, 191.76 and 129.35

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Solution

The fourth proportional to 139.07, 191.76 and 129.35 is: 178.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.07 : 191.76 = 129.35 : x
  2. Step 2: Convert to fraction form
    139.07/191.76 = 129.35/x
  3. Step 3: Cross multiply
    139.07x = 191.76 × 129.35
  4. Step 4: Simplify right side
    139.07x = 24,804.16
  5. Step 5: Solve for x
    x = 24,804.16/139.07
  6. Step 6: Final answer
    x = 178.36

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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.