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Finding the Fourth Proportional to 139.51, 192.69 and 134.70

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Solution

The fourth proportional to 139.51, 192.69 and 134.70 is: 186.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.51 : 192.69 = 134.70 : x
  2. Step 2: Convert to fraction form
    139.51/192.69 = 134.70/x
  3. Step 3: Cross multiply
    139.51x = 192.69 × 134.70
  4. Step 4: Simplify right side
    139.51x = 25,955.34
  5. Step 5: Solve for x
    x = 25,955.34/139.51
  6. Step 6: Final answer
    x = 186.05

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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.