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Finding the Fourth Proportional to 28,475.78, 42,717.74 and 8,755.98

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Solution

The fourth proportional to 28,475.78, 42,717.74 and 8,755.98 is: 13,135.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,475.78 : 42,717.74 = 8,755.98 : x
  2. Step 2: Convert to fraction form
    28,475.78/42,717.74 = 8,755.98/x
  3. Step 3: Cross multiply
    28,475.78x = 42,717.74 × 8,755.98
  4. Step 4: Simplify right side
    28,475.78x = 374,035,633.31
  5. Step 5: Solve for x
    x = 374,035,633.31/28,475.78
  6. Step 6: Final answer
    x = 13,135.22

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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.