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Finding the Fourth Proportional to 28,555.26, 39,404.07 and 15,978.30

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Solution

The fourth proportional to 28,555.26, 39,404.07 and 15,978.30 is: 22,048.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,555.26 : 39,404.07 = 15,978.30 : x
  2. Step 2: Convert to fraction form
    28,555.26/39,404.07 = 15,978.30/x
  3. Step 3: Cross multiply
    28,555.26x = 39,404.07 × 15,978.30
  4. Step 4: Simplify right side
    28,555.26x = 629,610,051.68
  5. Step 5: Solve for x
    x = 629,610,051.68/28,555.26
  6. Step 6: Final answer
    x = 22,048.83

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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.