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Finding the Fourth Proportional to 70,659.60, 105,989.40 and 68,611.60

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Solution

The fourth proportional to 70,659.60, 105,989.40 and 68,611.60 is: 102,917.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,659.60 : 105,989.40 = 68,611.60 : x
  2. Step 2: Convert to fraction form
    70,659.60/105,989.40 = 68,611.60/x
  3. Step 3: Cross multiply
    70,659.60x = 105,989.40 × 68,611.60
  4. Step 4: Simplify right side
    70,659.60x = 7,272,102,317.04
  5. Step 5: Solve for x
    x = 7,272,102,317.04/70,659.60
  6. Step 6: Final answer
    x = 102,917.40

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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.