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Finding the Fourth Proportional to 8,039.70, 12,059.55 and 5,415.30

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Solution

The fourth proportional to 8,039.70, 12,059.55 and 5,415.30 is: 8,122.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,039.70 : 12,059.55 = 5,415.30 : x
  2. Step 2: Convert to fraction form
    8,039.70/12,059.55 = 5,415.30/x
  3. Step 3: Cross multiply
    8,039.70x = 12,059.55 × 5,415.30
  4. Step 4: Simplify right side
    8,039.70x = 65,306,081.12
  5. Step 5: Solve for x
    x = 65,306,081.12/8,039.70
  6. Step 6: Final answer
    x = 8,122.95

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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.