Home / 138,782.28-191,518.83-78,352.41

Finding the Fourth Proportional to 138,782.28, 191,518.83 and 78,352.41

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Solution

The fourth proportional to 138,782.28, 191,518.83 and 78,352.41 is: 108,125.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,782.28 : 191,518.83 = 78,352.41 : x
  2. Step 2: Convert to fraction form
    138,782.28/191,518.83 = 78,352.41/x
  3. Step 3: Cross multiply
    138,782.28x = 191,518.83 × 78,352.41
  4. Step 4: Simplify right side
    138,782.28x = 15,005,961,890.88
  5. Step 5: Solve for x
    x = 15,005,961,890.88/138,782.28
  6. Step 6: Final answer
    x = 108,125.92

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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.