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Finding the Fourth Proportional to 20,491.55, 28,278.24 and 11,539.13

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Solution

The fourth proportional to 20,491.55, 28,278.24 and 11,539.13 is: 15,923.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.55 : 28,278.24 = 11,539.13 : x
  2. Step 2: Convert to fraction form
    20,491.55/28,278.24 = 11,539.13/x
  3. Step 3: Cross multiply
    20,491.55x = 28,278.24 × 11,539.13
  4. Step 4: Simplify right side
    20,491.55x = 326,306,146.14
  5. Step 5: Solve for x
    x = 326,306,146.14/20,491.55
  6. Step 6: Final answer
    x = 15,923.94

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.