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Finding the Fourth Proportional to 80,998.40, 121,411.20 and 31,059.20

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Solution

The fourth proportional to 80,998.40, 121,411.20 and 31,059.20 is: 46,555.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,998.40 : 121,411.20 = 31,059.20 : x
  2. Step 2: Convert to fraction form
    80,998.40/121,411.20 = 31,059.20/x
  3. Step 3: Cross multiply
    80,998.40x = 121,411.20 × 31,059.20
  4. Step 4: Simplify right side
    80,998.40x = 3,770,934,743.04
  5. Step 5: Solve for x
    x = 3,770,934,743.04/80,998.40
  6. Step 6: Final answer
    x = 46,555.67

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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.