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Finding the Fourth Proportional to 80,605.40, 120,908.10 and 28,020.20

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Solution

The fourth proportional to 80,605.40, 120,908.10 and 28,020.20 is: 42,030.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,605.40 : 120,908.10 = 28,020.20 : x
  2. Step 2: Convert to fraction form
    80,605.40/120,908.10 = 28,020.20/x
  3. Step 3: Cross multiply
    80,605.40x = 120,908.10 × 28,020.20
  4. Step 4: Simplify right side
    80,605.40x = 3,387,869,143.62
  5. Step 5: Solve for x
    x = 3,387,869,143.62/80,605.40
  6. Step 6: Final answer
    x = 42,030.30

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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.