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Finding the Fourth Proportional to 28,487.05, 42,729 and 8,763.06

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Solution

The fourth proportional to 28,487.05, 42,729 and 8,763.06 is: 13,144.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,487.05 : 42,729 = 8,763.06 : x
  2. Step 2: Convert to fraction form
    28,487.05/42,729 = 8,763.06/x
  3. Step 3: Cross multiply
    28,487.05x = 42,729 × 8,763.06
  4. Step 4: Simplify right side
    28,487.05x = 374,436,790.74
  5. Step 5: Solve for x
    x = 374,436,790.74/28,487.05
  6. Step 6: Final answer
    x = 13,144.11

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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.