Home / 120,840.40-166,899.36-80,487.76

Finding the Fourth Proportional to 120,840.40, 166,899.36 and 80,487.76

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Solution

The fourth proportional to 120,840.40, 166,899.36 and 80,487.76 is: 111,166.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,840.40 : 166,899.36 = 80,487.76 : x
  2. Step 2: Convert to fraction form
    120,840.40/166,899.36 = 80,487.76/x
  3. Step 3: Cross multiply
    120,840.40x = 166,899.36 × 80,487.76
  4. Step 4: Simplify right side
    120,840.40x = 13,433,355,631.83
  5. Step 5: Solve for x
    x = 13,433,355,631.83/120,840.40
  6. Step 6: Final answer
    x = 111,166.10

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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.