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Finding the Fourth Proportional to 120,620.20, 180,930.30 and 83,295.40

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Solution

The fourth proportional to 120,620.20, 180,930.30 and 83,295.40 is: 124,943.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,620.20 : 180,930.30 = 83,295.40 : x
  2. Step 2: Convert to fraction form
    120,620.20/180,930.30 = 83,295.40/x
  3. Step 3: Cross multiply
    120,620.20x = 180,930.30 × 83,295.40
  4. Step 4: Simplify right side
    120,620.20x = 15,070,661,710.62
  5. Step 5: Solve for x
    x = 15,070,661,710.62/120,620.20
  6. Step 6: Final answer
    x = 124,943.10

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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.