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Finding the Fourth Proportional to 28,838, 39,796.44 and 15,590

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Solution

The fourth proportional to 28,838, 39,796.44 and 15,590 is: 21,514.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,838 : 39,796.44 = 15,590 : x
  2. Step 2: Convert to fraction form
    28,838/39,796.44 = 15,590/x
  3. Step 3: Cross multiply
    28,838x = 39,796.44 × 15,590
  4. Step 4: Simplify right side
    28,838x = 620,426,499.60
  5. Step 5: Solve for x
    x = 620,426,499.60/28,838
  6. Step 6: Final answer
    x = 21,514.20

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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.