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Finding the Fourth Proportional to 28,215, 38,938.05 and 15,639.75

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Solution

The fourth proportional to 28,215, 38,938.05 and 15,639.75 is: 21,583.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,215 : 38,938.05 = 15,639.75 : x
  2. Step 2: Convert to fraction form
    28,215/38,938.05 = 15,639.75/x
  3. Step 3: Cross multiply
    28,215x = 38,938.05 × 15,639.75
  4. Step 4: Simplify right side
    28,215x = 608,981,367.49
  5. Step 5: Solve for x
    x = 608,981,367.49/28,215
  6. Step 6: Final answer
    x = 21,583.60

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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.