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Finding the Fourth Proportional to 71,321.88, 107,002.81 and 28,657.26

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Solution

The fourth proportional to 71,321.88, 107,002.81 and 28,657.26 is: 42,993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,321.88 : 107,002.81 = 28,657.26 : x
  2. Step 2: Convert to fraction form
    71,321.88/107,002.81 = 28,657.26/x
  3. Step 3: Cross multiply
    71,321.88x = 107,002.81 × 28,657.26
  4. Step 4: Simplify right side
    71,321.88x = 3,066,407,676.52
  5. Step 5: Solve for x
    x = 3,066,407,676.52/71,321.88
  6. Step 6: Final answer
    x = 42,993.93

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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.