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Finding the Fourth Proportional to 139.69, 192.79 and 77.53

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Solution

The fourth proportional to 139.69, 192.79 and 77.53 is: 107.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.69 : 192.79 = 77.53 : x
  2. Step 2: Convert to fraction form
    139.69/192.79 = 77.53/x
  3. Step 3: Cross multiply
    139.69x = 192.79 × 77.53
  4. Step 4: Simplify right side
    139.69x = 14,947.01
  5. Step 5: Solve for x
    x = 14,947.01/139.69
  6. Step 6: Final answer
    x = 107.00

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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.