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Finding the Fourth Proportional to 28,821, 39,772.98 and 15,573

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Solution

The fourth proportional to 28,821, 39,772.98 and 15,573 is: 21,490.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,821 : 39,772.98 = 15,573 : x
  2. Step 2: Convert to fraction form
    28,821/39,772.98 = 15,573/x
  3. Step 3: Cross multiply
    28,821x = 39,772.98 × 15,573
  4. Step 4: Simplify right side
    28,821x = 619,384,617.54
  5. Step 5: Solve for x
    x = 619,384,617.54/28,821
  6. Step 6: Final answer
    x = 21,490.74

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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.