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Finding the Fourth Proportional to 15,198.98, 20,978.09 and 8,913.38

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Solution

The fourth proportional to 15,198.98, 20,978.09 and 8,913.38 is: 12,302.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,198.98 : 20,978.09 = 8,913.38 : x
  2. Step 2: Convert to fraction form
    15,198.98/20,978.09 = 8,913.38/x
  3. Step 3: Cross multiply
    15,198.98x = 20,978.09 × 8,913.38
  4. Step 4: Simplify right side
    15,198.98x = 186,985,538.39
  5. Step 5: Solve for x
    x = 186,985,538.39/15,198.98
  6. Step 6: Final answer
    x = 12,302.51

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1.5x scale

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.