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Finding the Fourth Proportional to 139.40, 192.38 and 77.23

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Solution

The fourth proportional to 139.40, 192.38 and 77.23 is: 106.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.40 : 192.38 = 77.23 : x
  2. Step 2: Convert to fraction form
    139.40/192.38 = 77.23/x
  3. Step 3: Cross multiply
    139.40x = 192.38 × 77.23
  4. Step 4: Simplify right side
    139.40x = 14,857.51
  5. Step 5: Solve for x
    x = 14,857.51/139.40
  6. Step 6: Final answer
    x = 106.58

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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.