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Finding the Fourth Proportional to 13,338.76, 20,009.16 and 3,978.06

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Solution

The fourth proportional to 13,338.76, 20,009.16 and 3,978.06 is: 5,967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,338.76 : 20,009.16 = 3,978.06 : x
  2. Step 2: Convert to fraction form
    13,338.76/20,009.16 = 3,978.06/x
  3. Step 3: Cross multiply
    13,338.76x = 20,009.16 × 3,978.06
  4. Step 4: Simplify right side
    13,338.76x = 79,597,639.03
  5. Step 5: Solve for x
    x = 79,597,639.03/13,338.76
  6. Step 6: Final answer
    x = 5,967.40

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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.