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Finding the Fourth Proportional to 8,665.03, 12,999.30 and 2,820.07

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Solution

The fourth proportional to 8,665.03, 12,999.30 and 2,820.07 is: 4,230.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.03 : 12,999.30 = 2,820.07 : x
  2. Step 2: Convert to fraction form
    8,665.03/12,999.30 = 2,820.07/x
  3. Step 3: Cross multiply
    8,665.03x = 12,999.30 × 2,820.07
  4. Step 4: Simplify right side
    8,665.03x = 36,658,935.95
  5. Step 5: Solve for x
    x = 36,658,935.95/8,665.03
  6. Step 6: Final answer
    x = 4,230.68

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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.