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Finding the Fourth Proportional to 76,969.86, 105,810.66 and 66,174.96

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Solution

The fourth proportional to 76,969.86, 105,810.66 and 66,174.96 is: 90,970.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,969.86 : 105,810.66 = 66,174.96 : x
  2. Step 2: Convert to fraction form
    76,969.86/105,810.66 = 66,174.96/x
  3. Step 3: Cross multiply
    76,969.86x = 105,810.66 × 66,174.96
  4. Step 4: Simplify right side
    76,969.86x = 7,002,016,589.86
  5. Step 5: Solve for x
    x = 7,002,016,589.86/76,969.86
  6. Step 6: Final answer
    x = 90,970.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.