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Finding the Fourth Proportional to 18,825.72, 28,247.90 and 13,314.48

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Solution

The fourth proportional to 18,825.72, 28,247.90 and 13,314.48 is: 19,978.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,825.72 : 28,247.90 = 13,314.48 : x
  2. Step 2: Convert to fraction form
    18,825.72/28,247.90 = 13,314.48/x
  3. Step 3: Cross multiply
    18,825.72x = 28,247.90 × 13,314.48
  4. Step 4: Simplify right side
    18,825.72x = 376,106,033.02
  5. Step 5: Solve for x
    x = 376,106,033.02/18,825.72
  6. Step 6: Final answer
    x = 19,978.31

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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.