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Finding the Fourth Proportional to 15,085.99, 20,817.78 and 8,371.13

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Solution

The fourth proportional to 15,085.99, 20,817.78 and 8,371.13 is: 11,551.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,085.99 : 20,817.78 = 8,371.13 : x
  2. Step 2: Convert to fraction form
    15,085.99/20,817.78 = 8,371.13/x
  3. Step 3: Cross multiply
    15,085.99x = 20,817.78 × 8,371.13
  4. Step 4: Simplify right side
    15,085.99x = 174,268,342.69
  5. Step 5: Solve for x
    x = 174,268,342.69/15,085.99
  6. Step 6: Final answer
    x = 11,551.67

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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.