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Finding the Fourth Proportional to 70,628.68, 105,968.88 and 66,455.56

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Solution

The fourth proportional to 70,628.68, 105,968.88 and 66,455.56 is: 99,707.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,628.68 : 105,968.88 = 66,455.56 : x
  2. Step 2: Convert to fraction form
    70,628.68/105,968.88 = 66,455.56/x
  3. Step 3: Cross multiply
    70,628.68x = 105,968.88 × 66,455.56
  4. Step 4: Simplify right side
    70,628.68x = 7,042,221,262.97
  5. Step 5: Solve for x
    x = 7,042,221,262.97/70,628.68
  6. Step 6: Final answer
    x = 99,707.67

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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.