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Finding the Fourth Proportional to 13,805.20, 20,683.40 and 13,348.40

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Solution

The fourth proportional to 13,805.20, 20,683.40 and 13,348.40 is: 19,999.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,805.20 : 20,683.40 = 13,348.40 : x
  2. Step 2: Convert to fraction form
    13,805.20/20,683.40 = 13,348.40/x
  3. Step 3: Cross multiply
    13,805.20x = 20,683.40 × 13,348.40
  4. Step 4: Simplify right side
    13,805.20x = 276,090,296.56
  5. Step 5: Solve for x
    x = 276,090,296.56/13,805.20
  6. Step 6: Final answer
    x = 19,999.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.