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Finding the Fourth Proportional to 28,884, 39,859.92 and 15,636

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Solution

The fourth proportional to 28,884, 39,859.92 and 15,636 is: 21,577.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,884 : 39,859.92 = 15,636 : x
  2. Step 2: Convert to fraction form
    28,884/39,859.92 = 15,636/x
  3. Step 3: Cross multiply
    28,884x = 39,859.92 × 15,636
  4. Step 4: Simplify right side
    28,884x = 623,249,709.12
  5. Step 5: Solve for x
    x = 623,249,709.12/28,884
  6. Step 6: Final answer
    x = 21,577.68

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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.