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Finding the Fourth Proportional to 76,809.20, 115,213.80 and 73,180.40

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Solution

The fourth proportional to 76,809.20, 115,213.80 and 73,180.40 is: 109,770.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,809.20 : 115,213.80 = 73,180.40 : x
  2. Step 2: Convert to fraction form
    76,809.20/115,213.80 = 73,180.40/x
  3. Step 3: Cross multiply
    76,809.20x = 115,213.80 × 73,180.40
  4. Step 4: Simplify right side
    76,809.20x = 8,431,391,969.52
  5. Step 5: Solve for x
    x = 8,431,391,969.52/76,809.20
  6. Step 6: Final answer
    x = 109,770.60

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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.