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Finding the Fourth Proportional to 28,640.70, 42,965.10 and 8,917.20

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Solution

The fourth proportional to 28,640.70, 42,965.10 and 8,917.20 is: 13,377.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.70 : 42,965.10 = 8,917.20 : x
  2. Step 2: Convert to fraction form
    28,640.70/42,965.10 = 8,917.20/x
  3. Step 3: Cross multiply
    28,640.70x = 42,965.10 × 8,917.20
  4. Step 4: Simplify right side
    28,640.70x = 383,128,389.72
  5. Step 5: Solve for x
    x = 383,128,389.72/28,640.70
  6. Step 6: Final answer
    x = 13,377.06

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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.