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Finding the Fourth Proportional to 103,059.20, 154,588.80 and 80,940.80

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Solution

The fourth proportional to 103,059.20, 154,588.80 and 80,940.80 is: 121,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,059.20 : 154,588.80 = 80,940.80 : x
  2. Step 2: Convert to fraction form
    103,059.20/154,588.80 = 80,940.80/x
  3. Step 3: Cross multiply
    103,059.20x = 154,588.80 × 80,940.80
  4. Step 4: Simplify right side
    103,059.20x = 12,512,541,143.04
  5. Step 5: Solve for x
    x = 12,512,541,143.04/103,059.20
  6. Step 6: Final answer
    x = 121,411.20

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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.