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Finding the Fourth Proportional to 8,675.78, 13,005.84 and 3,125.21

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Solution

The fourth proportional to 8,675.78, 13,005.84 and 3,125.21 is: 4,684.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,675.78 : 13,005.84 = 3,125.21 : x
  2. Step 2: Convert to fraction form
    8,675.78/13,005.84 = 3,125.21/x
  3. Step 3: Cross multiply
    8,675.78x = 13,005.84 × 3,125.21
  4. Step 4: Simplify right side
    8,675.78x = 40,645,916.20
  5. Step 5: Solve for x
    x = 40,645,916.20/8,675.78
  6. Step 6: Final answer
    x = 4,684.99

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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.