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Finding the Fourth Proportional to 139,390.20, 192,357.45 and 75,728.52

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Solution

The fourth proportional to 139,390.20, 192,357.45 and 75,728.52 is: 104,504.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,390.20 : 192,357.45 = 75,728.52 : x
  2. Step 2: Convert to fraction form
    139,390.20/192,357.45 = 75,728.52/x
  3. Step 3: Cross multiply
    139,390.20x = 192,357.45 × 75,728.52
  4. Step 4: Simplify right side
    139,390.20x = 14,566,944,999.47
  5. Step 5: Solve for x
    x = 14,566,944,999.47/139,390.20
  6. Step 6: Final answer
    x = 104,504.80

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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.