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Finding the Fourth Proportional to 18,990.56, 26,201.79 and 13,023.69

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Solution

The fourth proportional to 18,990.56, 26,201.79 and 13,023.69 is: 17,969.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.56 : 26,201.79 = 13,023.69 : x
  2. Step 2: Convert to fraction form
    18,990.56/26,201.79 = 13,023.69/x
  3. Step 3: Cross multiply
    18,990.56x = 26,201.79 × 13,023.69
  4. Step 4: Simplify right side
    18,990.56x = 341,243,990.41
  5. Step 5: Solve for x
    x = 341,243,990.41/18,990.56
  6. Step 6: Final answer
    x = 17,969.14

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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.