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Finding the Fourth Proportional to 139.48, 192.69 and 112.07

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Solution

The fourth proportional to 139.48, 192.69 and 112.07 is: 154.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.48 : 192.69 = 112.07 : x
  2. Step 2: Convert to fraction form
    139.48/192.69 = 112.07/x
  3. Step 3: Cross multiply
    139.48x = 192.69 × 112.07
  4. Step 4: Simplify right side
    139.48x = 21,594.77
  5. Step 5: Solve for x
    x = 21,594.77/139.48
  6. Step 6: Final answer
    x = 154.82

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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.