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Finding the Fourth Proportional to 79,091.17, 109,143.16 and 43,278.78

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Solution

The fourth proportional to 79,091.17, 109,143.16 and 43,278.78 is: 59,723.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,091.17 : 109,143.16 = 43,278.78 : x
  2. Step 2: Convert to fraction form
    79,091.17/109,143.16 = 43,278.78/x
  3. Step 3: Cross multiply
    79,091.17x = 109,143.16 × 43,278.78
  4. Step 4: Simplify right side
    79,091.17x = 4,723,582,810.14
  5. Step 5: Solve for x
    x = 4,723,582,810.14/79,091.17
  6. Step 6: Final answer
    x = 59,723.26

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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.