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Finding the Fourth Proportional to 139,442.10, 192,422.28 and 75,779.47

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Solution

The fourth proportional to 139,442.10, 192,422.28 and 75,779.47 is: 104,571.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,442.10 : 192,422.28 = 75,779.47 : x
  2. Step 2: Convert to fraction form
    139,442.10/192,422.28 = 75,779.47/x
  3. Step 3: Cross multiply
    139,442.10x = 192,422.28 × 75,779.47
  4. Step 4: Simplify right side
    139,442.10x = 14,581,658,394.59
  5. Step 5: Solve for x
    x = 14,581,658,394.59/139,442.10
  6. Step 6: Final answer
    x = 104,571.42

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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.