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Finding the Fourth Proportional to 8,620.62, 12,929.28 and 2,777.28

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Solution

The fourth proportional to 8,620.62, 12,929.28 and 2,777.28 is: 4,165.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.62 : 12,929.28 = 2,777.28 : x
  2. Step 2: Convert to fraction form
    8,620.62/12,929.28 = 2,777.28/x
  3. Step 3: Cross multiply
    8,620.62x = 12,929.28 × 2,777.28
  4. Step 4: Simplify right side
    8,620.62x = 35,908,230.76
  5. Step 5: Solve for x
    x = 35,908,230.76/8,620.62
  6. Step 6: Final answer
    x = 4,165.39

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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.