Home / 81,317.70-121,976.55-68,487.30

Finding the Fourth Proportional to 81,317.70, 121,976.55 and 68,487.30

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Solution

The fourth proportional to 81,317.70, 121,976.55 and 68,487.30 is: 102,730.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,317.70 : 121,976.55 = 68,487.30 : x
  2. Step 2: Convert to fraction form
    81,317.70/121,976.55 = 68,487.30/x
  3. Step 3: Cross multiply
    81,317.70x = 121,976.55 × 68,487.30
  4. Step 4: Simplify right side
    81,317.70x = 8,353,844,572.82
  5. Step 5: Solve for x
    x = 8,353,844,572.82/81,317.70
  6. Step 6: Final answer
    x = 102,730.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.