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Finding the Fourth Proportional to 80,618.85, 120,928.23 and 28,028.32

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Solution

The fourth proportional to 80,618.85, 120,928.23 and 28,028.32 is: 42,042.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,618.85 : 120,928.23 = 28,028.32 : x
  2. Step 2: Convert to fraction form
    80,618.85/120,928.23 = 28,028.32/x
  3. Step 3: Cross multiply
    80,618.85x = 120,928.23 × 28,028.32
  4. Step 4: Simplify right side
    80,618.85x = 3,389,415,127.47
  5. Step 5: Solve for x
    x = 3,389,415,127.47/80,618.85
  6. Step 6: Final answer
    x = 42,042.46

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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.