Home / 138,860.52-191,626.02-78,431.28

Finding the Fourth Proportional to 138,860.52, 191,626.02 and 78,431.28

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Solution

The fourth proportional to 138,860.52, 191,626.02 and 78,431.28 is: 108,234.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,860.52 : 191,626.02 = 78,431.28 : x
  2. Step 2: Convert to fraction form
    138,860.52/191,626.02 = 78,431.28/x
  3. Step 3: Cross multiply
    138,860.52x = 191,626.02 × 78,431.28
  4. Step 4: Simplify right side
    138,860.52x = 15,029,474,029.91
  5. Step 5: Solve for x
    x = 15,029,474,029.91/138,860.52
  6. Step 6: Final answer
    x = 108,234.32

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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.