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Finding the Fourth Proportional to 28,893, 39,872.34 and 15,645

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Solution

The fourth proportional to 28,893, 39,872.34 and 15,645 is: 21,590.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,893 : 39,872.34 = 15,645 : x
  2. Step 2: Convert to fraction form
    28,893/39,872.34 = 15,645/x
  3. Step 3: Cross multiply
    28,893x = 39,872.34 × 15,645
  4. Step 4: Simplify right side
    28,893x = 623,802,759.30
  5. Step 5: Solve for x
    x = 623,802,759.30/28,893
  6. Step 6: Final answer
    x = 21,590.10

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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.