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Finding the Fourth Proportional to 139,649.31, 192,718.36 and 75,987.43

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Solution

The fourth proportional to 139,649.31, 192,718.36 and 75,987.43 is: 104,863.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,649.31 : 192,718.36 = 75,987.43 : x
  2. Step 2: Convert to fraction form
    139,649.31/192,718.36 = 75,987.43/x
  3. Step 3: Cross multiply
    139,649.31x = 192,718.36 × 75,987.43
  4. Step 4: Simplify right side
    139,649.31x = 14,644,172,510.28
  5. Step 5: Solve for x
    x = 14,644,172,510.28/139,649.31
  6. Step 6: Final answer
    x = 104,863.91

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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.