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Finding the Fourth Proportional to 28,616.70, 42,929.10 and 8,893.20

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Solution

The fourth proportional to 28,616.70, 42,929.10 and 8,893.20 is: 13,341.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,616.70 : 42,929.10 = 8,893.20 : x
  2. Step 2: Convert to fraction form
    28,616.70/42,929.10 = 8,893.20/x
  3. Step 3: Cross multiply
    28,616.70x = 42,929.10 × 8,893.20
  4. Step 4: Simplify right side
    28,616.70x = 381,777,072.12
  5. Step 5: Solve for x
    x = 381,777,072.12/28,616.70
  6. Step 6: Final answer
    x = 13,341.06

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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.