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Finding the Fourth Proportional to 139,648.56, 192,717.32 and 75,986.68

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Solution

The fourth proportional to 139,648.56, 192,717.32 and 75,986.68 is: 104,862.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,648.56 : 192,717.32 = 75,986.68 : x
  2. Step 2: Convert to fraction form
    139,648.56/192,717.32 = 75,986.68/x
  3. Step 3: Cross multiply
    139,648.56x = 192,717.32 × 75,986.68
  4. Step 4: Simplify right side
    139,648.56x = 14,643,949,325.30
  5. Step 5: Solve for x
    x = 14,643,949,325.30/139,648.56
  6. Step 6: Final answer
    x = 104,862.87

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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.