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Finding the Fourth Proportional to 15,186.84, 20,950.70 and 9,879.72

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Solution

The fourth proportional to 15,186.84, 20,950.70 and 9,879.72 is: 13,629.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,186.84 : 20,950.70 = 9,879.72 : x
  2. Step 2: Convert to fraction form
    15,186.84/20,950.70 = 9,879.72/x
  3. Step 3: Cross multiply
    15,186.84x = 20,950.70 × 9,879.72
  4. Step 4: Simplify right side
    15,186.84x = 206,987,000.41
  5. Step 5: Solve for x
    x = 206,987,000.41/15,186.84
  6. Step 6: Final answer
    x = 13,629.37

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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.