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Finding the Fourth Proportional to 72,790, 109,068 and 61,126

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Solution

The fourth proportional to 72,790, 109,068 and 61,126 is: 91,590.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,790 : 109,068 = 61,126 : x
  2. Step 2: Convert to fraction form
    72,790/109,068 = 61,126/x
  3. Step 3: Cross multiply
    72,790x = 109,068 × 61,126
  4. Step 4: Simplify right side
    72,790x = 6,666,890,568
  5. Step 5: Solve for x
    x = 6,666,890,568/72,790
  6. Step 6: Final answer
    x = 91,590.75

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.