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Finding the Fourth Proportional to 80,673.84, 120,751.20 and 43,140

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Solution

The fourth proportional to 80,673.84, 120,751.20 and 43,140 is: 64,571.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,673.84 : 120,751.20 = 43,140 : x
  2. Step 2: Convert to fraction form
    80,673.84/120,751.20 = 43,140/x
  3. Step 3: Cross multiply
    80,673.84x = 120,751.20 × 43,140
  4. Step 4: Simplify right side
    80,673.84x = 5,209,206,768
  5. Step 5: Solve for x
    x = 5,209,206,768/80,673.84
  6. Step 6: Final answer
    x = 64,571.20

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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.