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Finding the Fourth Proportional to 8,420, 12,630 and 2,576.60

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Solution

The fourth proportional to 8,420, 12,630 and 2,576.60 is: 3,864.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420 : 12,630 = 2,576.60 : x
  2. Step 2: Convert to fraction form
    8,420/12,630 = 2,576.60/x
  3. Step 3: Cross multiply
    8,420x = 12,630 × 2,576.60
  4. Step 4: Simplify right side
    8,420x = 32,542,458
  5. Step 5: Solve for x
    x = 32,542,458/8,420
  6. Step 6: Final answer
    x = 3,864.90

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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.