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Finding the Fourth Proportional to 139,390.49, 192,359.79 and 75,728.27

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Solution

The fourth proportional to 139,390.49, 192,359.79 and 75,728.27 is: 104,505.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,390.49 : 192,359.79 = 75,728.27 : x
  2. Step 2: Convert to fraction form
    139,390.49/192,359.79 = 75,728.27/x
  3. Step 3: Cross multiply
    139,390.49x = 192,359.79 × 75,728.27
  4. Step 4: Simplify right side
    139,390.49x = 14,567,073,152.46
  5. Step 5: Solve for x
    x = 14,567,073,152.46/139,390.49
  6. Step 6: Final answer
    x = 104,505.51

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1.5x scale

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.