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Finding the Fourth Proportional to 112,287, 154,956.36 and 61,986

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Solution

The fourth proportional to 112,287, 154,956.36 and 61,986 is: 85,540.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,287 : 154,956.36 = 61,986 : x
  2. Step 2: Convert to fraction form
    112,287/154,956.36 = 61,986/x
  3. Step 3: Cross multiply
    112,287x = 154,956.36 × 61,986
  4. Step 4: Simplify right side
    112,287x = 9,605,124,930.96
  5. Step 5: Solve for x
    x = 9,605,124,930.96/112,287
  6. Step 6: Final answer
    x = 85,540.85

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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.