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Finding the Fourth Proportional to 76,809.69, 105,945.51 and 66,720.56

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Solution

The fourth proportional to 76,809.69, 105,945.51 and 66,720.56 is: 92,029.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,809.69 : 105,945.51 = 66,720.56 : x
  2. Step 2: Convert to fraction form
    76,809.69/105,945.51 = 66,720.56/x
  3. Step 3: Cross multiply
    76,809.69x = 105,945.51 × 66,720.56
  4. Step 4: Simplify right side
    76,809.69x = 7,068,743,756.69
  5. Step 5: Solve for x
    x = 7,068,743,756.69/76,809.69
  6. Step 6: Final answer
    x = 92,029.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.