Home / 78,390.32-108,137.18-49,659.30

Finding the Fourth Proportional to 78,390.32, 108,137.18 and 49,659.30

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Solution

The fourth proportional to 78,390.32, 108,137.18 and 49,659.30 is: 68,503.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.32 : 108,137.18 = 49,659.30 : x
  2. Step 2: Convert to fraction form
    78,390.32/108,137.18 = 49,659.30/x
  3. Step 3: Cross multiply
    78,390.32x = 108,137.18 × 49,659.30
  4. Step 4: Simplify right side
    78,390.32x = 5,370,016,786.92
  5. Step 5: Solve for x
    x = 5,370,016,786.92/78,390.32
  6. Step 6: Final answer
    x = 68,503.57

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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.