Home / 138,541.80-191,183.84-78,111.92

Finding the Fourth Proportional to 138,541.80, 191,183.84 and 78,111.92

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Solution

The fourth proportional to 138,541.80, 191,183.84 and 78,111.92 is: 107,792.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,541.80 : 191,183.84 = 78,111.92 : x
  2. Step 2: Convert to fraction form
    138,541.80/191,183.84 = 78,111.92/x
  3. Step 3: Cross multiply
    138,541.80x = 191,183.84 × 78,111.92
  4. Step 4: Simplify right side
    138,541.80x = 14,933,736,815.37
  5. Step 5: Solve for x
    x = 14,933,736,815.37/138,541.80
  6. Step 6: Final answer
    x = 107,792.28

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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.