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Finding the Fourth Proportional to 28,379.62, 39,164.16 and 15,804.64

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Solution

The fourth proportional to 28,379.62, 39,164.16 and 15,804.64 is: 21,810.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.62 : 39,164.16 = 15,804.64 : x
  2. Step 2: Convert to fraction form
    28,379.62/39,164.16 = 15,804.64/x
  3. Step 3: Cross multiply
    28,379.62x = 39,164.16 × 15,804.64
  4. Step 4: Simplify right side
    28,379.62x = 618,975,449.70
  5. Step 5: Solve for x
    x = 618,975,449.70/28,379.62
  6. Step 6: Final answer
    x = 21,810.56

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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.