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Finding the Fourth Proportional to 18,420.56, 25,428.03 and 13,945.58

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Solution

The fourth proportional to 18,420.56, 25,428.03 and 13,945.58 is: 19,250.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.56 : 25,428.03 = 13,945.58 : x
  2. Step 2: Convert to fraction form
    18,420.56/25,428.03 = 13,945.58/x
  3. Step 3: Cross multiply
    18,420.56x = 25,428.03 × 13,945.58
  4. Step 4: Simplify right side
    18,420.56x = 354,608,626.61
  5. Step 5: Solve for x
    x = 354,608,626.61/18,420.56
  6. Step 6: Final answer
    x = 19,250.70

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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.