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Finding the Fourth Proportional to 112,020.78, 154,589.13 and 61,719.78

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Solution

The fourth proportional to 112,020.78, 154,589.13 and 61,719.78 is: 85,173.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,020.78 : 154,589.13 = 61,719.78 : x
  2. Step 2: Convert to fraction form
    112,020.78/154,589.13 = 61,719.78/x
  3. Step 3: Cross multiply
    112,020.78x = 154,589.13 × 61,719.78
  4. Step 4: Simplify right side
    112,020.78x = 9,541,207,093.99
  5. Step 5: Solve for x
    x = 9,541,207,093.99/112,020.78
  6. Step 6: Final answer
    x = 85,173.55

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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.