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Finding the Fourth Proportional to 70,668.80, 105,407.86 and 65,769.92

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Solution

The fourth proportional to 70,668.80, 105,407.86 and 65,769.92 is: 98,100.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,668.80 : 105,407.86 = 65,769.92 : x
  2. Step 2: Convert to fraction form
    70,668.80/105,407.86 = 65,769.92/x
  3. Step 3: Cross multiply
    70,668.80x = 105,407.86 × 65,769.92
  4. Step 4: Simplify right side
    70,668.80x = 6,932,666,519.57
  5. Step 5: Solve for x
    x = 6,932,666,519.57/70,668.80
  6. Step 6: Final answer
    x = 98,100.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.