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Finding the Fourth Proportional to 15,141.98, 20,891.73 and 9,090.65

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Solution

The fourth proportional to 15,141.98, 20,891.73 and 9,090.65 is: 12,542.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,141.98 : 20,891.73 = 9,090.65 : x
  2. Step 2: Convert to fraction form
    15,141.98/20,891.73 = 9,090.65/x
  3. Step 3: Cross multiply
    15,141.98x = 20,891.73 × 9,090.65
  4. Step 4: Simplify right side
    15,141.98x = 189,919,300.87
  5. Step 5: Solve for x
    x = 189,919,300.87/15,141.98
  6. Step 6: Final answer
    x = 12,542.57

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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.