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Finding the Fourth Proportional to 19,689.80, 27,170.94 and 11,190.80

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Solution

The fourth proportional to 19,689.80, 27,170.94 and 11,190.80 is: 15,442.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,689.80 : 27,170.94 = 11,190.80 : x
  2. Step 2: Convert to fraction form
    19,689.80/27,170.94 = 11,190.80/x
  3. Step 3: Cross multiply
    19,689.80x = 27,170.94 × 11,190.80
  4. Step 4: Simplify right side
    19,689.80x = 304,064,588.83
  5. Step 5: Solve for x
    x = 304,064,588.83/19,689.80
  6. Step 6: Final answer
    x = 15,442.75

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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.