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Finding the Fourth Proportional to 80,043.78, 120,047.40 and 30,129.12

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Solution

The fourth proportional to 80,043.78, 120,047.40 and 30,129.12 is: 45,186.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,043.78 : 120,047.40 = 30,129.12 : x
  2. Step 2: Convert to fraction form
    80,043.78/120,047.40 = 30,129.12/x
  3. Step 3: Cross multiply
    80,043.78x = 120,047.40 × 30,129.12
  4. Step 4: Simplify right side
    80,043.78x = 3,616,922,520.29
  5. Step 5: Solve for x
    x = 3,616,922,520.29/80,043.78
  6. Step 6: Final answer
    x = 45,186.80

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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.