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Finding the Fourth Proportional to 18,911.90, 26,111.00 and 15,342.99

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Solution

The fourth proportional to 18,911.90, 26,111.00 and 15,342.99 is: 21,183.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.90 : 26,111.00 = 15,342.99 : x
  2. Step 2: Convert to fraction form
    18,911.90/26,111.00 = 15,342.99/x
  3. Step 3: Cross multiply
    18,911.90x = 26,111.00 × 15,342.99
  4. Step 4: Simplify right side
    18,911.90x = 400,620,735.18
  5. Step 5: Solve for x
    x = 400,620,735.18/18,911.90
  6. Step 6: Final answer
    x = 21,183.53

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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.