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Finding the Fourth Proportional to 76,808.40, 115,212.60 and 68,643.60

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Solution

The fourth proportional to 76,808.40, 115,212.60 and 68,643.60 is: 102,965.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,808.40 : 115,212.60 = 68,643.60 : x
  2. Step 2: Convert to fraction form
    76,808.40/115,212.60 = 68,643.60/x
  3. Step 3: Cross multiply
    76,808.40x = 115,212.60 × 68,643.60
  4. Step 4: Simplify right side
    76,808.40x = 7,908,607,629.36
  5. Step 5: Solve for x
    x = 7,908,607,629.36/76,808.40
  6. Step 6: Final answer
    x = 102,965.40

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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.