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Finding the Fourth Proportional to 139,321.52, 192,268.45 and 78,070.29

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Solution

The fourth proportional to 139,321.52, 192,268.45 and 78,070.29 is: 107,739.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,321.52 : 192,268.45 = 78,070.29 : x
  2. Step 2: Convert to fraction form
    139,321.52/192,268.45 = 78,070.29/x
  3. Step 3: Cross multiply
    139,321.52x = 192,268.45 × 78,070.29
  4. Step 4: Simplify right side
    139,321.52x = 15,010,453,649.35
  5. Step 5: Solve for x
    x = 15,010,453,649.35/139,321.52
  6. Step 6: Final answer
    x = 107,739.66

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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.