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Finding the Fourth Proportional to 111,639.80, 167,313.90 and 80,438.60

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Solution

The fourth proportional to 111,639.80, 167,313.90 and 80,438.60 is: 120,552.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,639.80 : 167,313.90 = 80,438.60 : x
  2. Step 2: Convert to fraction form
    111,639.80/167,313.90 = 80,438.60/x
  3. Step 3: Cross multiply
    111,639.80x = 167,313.90 × 80,438.60
  4. Step 4: Simplify right side
    111,639.80x = 13,458,495,876.54
  5. Step 5: Solve for x
    x = 13,458,495,876.54/111,639.80
  6. Step 6: Final answer
    x = 120,552.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.