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Finding the Fourth Proportional to 137,620.80, 206,431.20 and 120,124.80

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Solution

The fourth proportional to 137,620.80, 206,431.20 and 120,124.80 is: 180,187.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,620.80 : 206,431.20 = 120,124.80 : x
  2. Step 2: Convert to fraction form
    137,620.80/206,431.20 = 120,124.80/x
  3. Step 3: Cross multiply
    137,620.80x = 206,431.20 × 120,124.80
  4. Step 4: Simplify right side
    137,620.80x = 24,797,506,613.76
  5. Step 5: Solve for x
    x = 24,797,506,613.76/137,620.80
  6. Step 6: Final answer
    x = 180,187.20

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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.