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Finding the Fourth Proportional to 28,819, 39,770.22 and 15,571

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Solution

The fourth proportional to 28,819, 39,770.22 and 15,571 is: 21,487.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,819 : 39,770.22 = 15,571 : x
  2. Step 2: Convert to fraction form
    28,819/39,770.22 = 15,571/x
  3. Step 3: Cross multiply
    28,819x = 39,770.22 × 15,571
  4. Step 4: Simplify right side
    28,819x = 619,262,095.62
  5. Step 5: Solve for x
    x = 619,262,095.62/28,819
  6. Step 6: Final answer
    x = 21,487.98

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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.