Home / 99,724.40-149,327.40-78,815.60

Finding the Fourth Proportional to 99,724.40, 149,327.40 and 78,815.60

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Solution

The fourth proportional to 99,724.40, 149,327.40 and 78,815.60 is: 118,018.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,724.40 : 149,327.40 = 78,815.60 : x
  2. Step 2: Convert to fraction form
    99,724.40/149,327.40 = 78,815.60/x
  3. Step 3: Cross multiply
    99,724.40x = 149,327.40 × 78,815.60
  4. Step 4: Simplify right side
    99,724.40x = 11,769,328,627.44
  5. Step 5: Solve for x
    x = 11,769,328,627.44/99,724.40
  6. Step 6: Final answer
    x = 118,018.55

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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.