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Finding the Fourth Proportional to 70,629.20, 105,814.20 and 65,963.60

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Solution

The fourth proportional to 70,629.20, 105,814.20 and 65,963.60 is: 98,824.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,629.20 : 105,814.20 = 65,963.60 : x
  2. Step 2: Convert to fraction form
    70,629.20/105,814.20 = 65,963.60/x
  3. Step 3: Cross multiply
    70,629.20x = 105,814.20 × 65,963.60
  4. Step 4: Simplify right side
    70,629.20x = 6,979,885,563.12
  5. Step 5: Solve for x
    x = 6,979,885,563.12/70,629.20
  6. Step 6: Final answer
    x = 98,824.36

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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.