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Finding the Fourth Proportional to 28,196.75, 38,916.17 and 21,469.70

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Solution

The fourth proportional to 28,196.75, 38,916.17 and 21,469.70 is: 29,631.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,196.75 : 38,916.17 = 21,469.70 : x
  2. Step 2: Convert to fraction form
    28,196.75/38,916.17 = 21,469.70/x
  3. Step 3: Cross multiply
    28,196.75x = 38,916.17 × 21,469.70
  4. Step 4: Simplify right side
    28,196.75x = 835,518,193.12
  5. Step 5: Solve for x
    x = 835,518,193.12/28,196.75
  6. Step 6: Final answer
    x = 29,631.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.