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Finding the Fourth Proportional to 139,445.44, 192,429.28 and 75,781.87

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Solution

The fourth proportional to 139,445.44, 192,429.28 and 75,781.87 is: 104,576.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,445.44 : 192,429.28 = 75,781.87 : x
  2. Step 2: Convert to fraction form
    139,445.44/192,429.28 = 75,781.87/x
  3. Step 3: Cross multiply
    139,445.44x = 192,429.28 × 75,781.87
  4. Step 4: Simplify right side
    139,445.44x = 14,582,650,681.15
  5. Step 5: Solve for x
    x = 14,582,650,681.15/139,445.44
  6. Step 6: Final answer
    x = 104,576.03

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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.