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Finding the Fourth Proportional to 8,620.80, 12,902.40 and 7,929.60

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Solution

The fourth proportional to 8,620.80, 12,902.40 and 7,929.60 is: 11,867.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.80 : 12,902.40 = 7,929.60 : x
  2. Step 2: Convert to fraction form
    8,620.80/12,902.40 = 7,929.60/x
  3. Step 3: Cross multiply
    8,620.80x = 12,902.40 × 7,929.60
  4. Step 4: Simplify right side
    8,620.80x = 102,310,871.04
  5. Step 5: Solve for x
    x = 102,310,871.04/8,620.80
  6. Step 6: Final answer
    x = 11,867.91

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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.