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Finding the Fourth Proportional to 13,338.79, 20,009.19 and 3,978.08

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Solution

The fourth proportional to 13,338.79, 20,009.19 and 3,978.08 is: 5,967.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,338.79 : 20,009.19 = 3,978.08 : x
  2. Step 2: Convert to fraction form
    13,338.79/20,009.19 = 3,978.08/x
  3. Step 3: Cross multiply
    13,338.79x = 20,009.19 × 3,978.08
  4. Step 4: Simplify right side
    13,338.79x = 79,598,073.43
  5. Step 5: Solve for x
    x = 79,598,073.43/13,338.79
  6. Step 6: Final answer
    x = 5,967.41

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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.