Home / 80,100.12-120,168.40-42,640.45

Finding the Fourth Proportional to 80,100.12, 120,168.40 and 42,640.45

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Solution

The fourth proportional to 80,100.12, 120,168.40 and 42,640.45 is: 63,970.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,100.12 : 120,168.40 = 42,640.45 : x
  2. Step 2: Convert to fraction form
    80,100.12/120,168.40 = 42,640.45/x
  3. Step 3: Cross multiply
    80,100.12x = 120,168.40 × 42,640.45
  4. Step 4: Simplify right side
    80,100.12x = 5,124,034,651.78
  5. Step 5: Solve for x
    x = 5,124,034,651.78/80,100.12
  6. Step 6: Final answer
    x = 63,970.37

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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.