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Finding the Fourth Proportional to 19,971, 27,559.98 and 11,139

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Solution

The fourth proportional to 19,971, 27,559.98 and 11,139 is: 15,371.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,971 : 27,559.98 = 11,139 : x
  2. Step 2: Convert to fraction form
    19,971/27,559.98 = 11,139/x
  3. Step 3: Cross multiply
    19,971x = 27,559.98 × 11,139
  4. Step 4: Simplify right side
    19,971x = 306,990,617.22
  5. Step 5: Solve for x
    x = 306,990,617.22/19,971
  6. Step 6: Final answer
    x = 15,371.82

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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.