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Finding the Fourth Proportional to 80,666.40, 120,999.60 and 28,081.20

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Solution

The fourth proportional to 80,666.40, 120,999.60 and 28,081.20 is: 42,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,666.40 : 120,999.60 = 28,081.20 : x
  2. Step 2: Convert to fraction form
    80,666.40/120,999.60 = 28,081.20/x
  3. Step 3: Cross multiply
    80,666.40x = 120,999.60 × 28,081.20
  4. Step 4: Simplify right side
    80,666.40x = 3,397,813,967.52
  5. Step 5: Solve for x
    x = 3,397,813,967.52/80,666.40
  6. Step 6: Final answer
    x = 42,121.80

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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.