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Finding the Fourth Proportional to 18,921.67, 26,084.60 and 13,238.81

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Solution

The fourth proportional to 18,921.67, 26,084.60 and 13,238.81 is: 18,250.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.67 : 26,084.60 = 13,238.81 : x
  2. Step 2: Convert to fraction form
    18,921.67/26,084.60 = 13,238.81/x
  3. Step 3: Cross multiply
    18,921.67x = 26,084.60 × 13,238.81
  4. Step 4: Simplify right side
    18,921.67x = 345,329,014.17
  5. Step 5: Solve for x
    x = 345,329,014.17/18,921.67
  6. Step 6: Final answer
    x = 18,250.45

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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.