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Finding the Fourth Proportional to 28,388.52, 39,175.65 and 15,813

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Solution

The fourth proportional to 28,388.52, 39,175.65 and 15,813 is: 21,821.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,388.52 : 39,175.65 = 15,813 : x
  2. Step 2: Convert to fraction form
    28,388.52/39,175.65 = 15,813/x
  3. Step 3: Cross multiply
    28,388.52x = 39,175.65 × 15,813
  4. Step 4: Simplify right side
    28,388.52x = 619,484,553.45
  5. Step 5: Solve for x
    x = 619,484,553.45/28,388.52
  6. Step 6: Final answer
    x = 21,821.66

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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.