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Finding the Fourth Proportional to 139.50, 192.51 and 77.34

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Solution

The fourth proportional to 139.50, 192.51 and 77.34 is: 106.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 192.51 = 77.34 : x
  2. Step 2: Convert to fraction form
    139.50/192.51 = 77.34/x
  3. Step 3: Cross multiply
    139.50x = 192.51 × 77.34
  4. Step 4: Simplify right side
    139.50x = 14,887.86
  5. Step 5: Solve for x
    x = 14,887.86/139.50
  6. Step 6: Final answer
    x = 106.72

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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.