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Finding the Fourth Proportional to 28,494, 39,321.48 and 15,748

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Solution

The fourth proportional to 28,494, 39,321.48 and 15,748 is: 21,732.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,494 : 39,321.48 = 15,748 : x
  2. Step 2: Convert to fraction form
    28,494/39,321.48 = 15,748/x
  3. Step 3: Cross multiply
    28,494x = 39,321.48 × 15,748
  4. Step 4: Simplify right side
    28,494x = 619,234,667.04
  5. Step 5: Solve for x
    x = 619,234,667.04/28,494
  6. Step 6: Final answer
    x = 21,732.11

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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.