Home / 120,631.72-166,478.34-78,226.60

Finding the Fourth Proportional to 120,631.72, 166,478.34 and 78,226.60

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Solution

The fourth proportional to 120,631.72, 166,478.34 and 78,226.60 is: 107,956.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,631.72 : 166,478.34 = 78,226.60 : x
  2. Step 2: Convert to fraction form
    120,631.72/166,478.34 = 78,226.60/x
  3. Step 3: Cross multiply
    120,631.72x = 166,478.34 × 78,226.60
  4. Step 4: Simplify right side
    120,631.72x = 13,023,034,511.84
  5. Step 5: Solve for x
    x = 13,023,034,511.84/120,631.72
  6. Step 6: Final answer
    x = 107,956.97

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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.