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Finding the Fourth Proportional to 78,305.87, 107,990.89 and 66,231.71

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Solution

The fourth proportional to 78,305.87, 107,990.89 and 66,231.71 is: 91,339.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,305.87 : 107,990.89 = 66,231.71 : x
  2. Step 2: Convert to fraction form
    78,305.87/107,990.89 = 66,231.71/x
  3. Step 3: Cross multiply
    78,305.87x = 107,990.89 × 66,231.71
  4. Step 4: Simplify right side
    78,305.87x = 7,152,421,008.55
  5. Step 5: Solve for x
    x = 7,152,421,008.55/78,305.87
  6. Step 6: Final answer
    x = 91,339.52

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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.