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Finding the Fourth Proportional to 28,379.52, 39,164 and 15,804.52

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Solution

The fourth proportional to 28,379.52, 39,164 and 15,804.52 is: 21,810.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.52 : 39,164 = 15,804.52 : x
  2. Step 2: Convert to fraction form
    28,379.52/39,164 = 15,804.52/x
  3. Step 3: Cross multiply
    28,379.52x = 39,164 × 15,804.52
  4. Step 4: Simplify right side
    28,379.52x = 618,968,221.28
  5. Step 5: Solve for x
    x = 618,968,221.28/28,379.52
  6. Step 6: Final answer
    x = 21,810.38

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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.