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Finding the Fourth Proportional to 70,628.20, 105,812.70 and 65,962.60

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Solution

The fourth proportional to 70,628.20, 105,812.70 and 65,962.60 is: 98,822.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,628.20 : 105,812.70 = 65,962.60 : x
  2. Step 2: Convert to fraction form
    70,628.20/105,812.70 = 65,962.60/x
  3. Step 3: Cross multiply
    70,628.20x = 105,812.70 × 65,962.60
  4. Step 4: Simplify right side
    70,628.20x = 6,979,680,805.02
  5. Step 5: Solve for x
    x = 6,979,680,805.02/70,628.20
  6. Step 6: Final answer
    x = 98,822.86

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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.