Home / 138,829.18-191,563.60-78,398.62

Finding the Fourth Proportional to 138,829.18, 191,563.60 and 78,398.62

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Solution

The fourth proportional to 138,829.18, 191,563.60 and 78,398.62 is: 108,178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,829.18 : 191,563.60 = 78,398.62 : x
  2. Step 2: Convert to fraction form
    138,829.18/191,563.60 = 78,398.62/x
  3. Step 3: Cross multiply
    138,829.18x = 191,563.60 × 78,398.62
  4. Step 4: Simplify right side
    138,829.18x = 15,018,321,882.23
  5. Step 5: Solve for x
    x = 15,018,321,882.23/138,829.18
  6. Step 6: Final answer
    x = 108,178.42

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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.