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Finding the Fourth Proportional to 20,745.52, 30,986.09 and 18,768.16

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Solution

The fourth proportional to 20,745.52, 30,986.09 and 18,768.16 is: 28,032.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,745.52 : 30,986.09 = 18,768.16 : x
  2. Step 2: Convert to fraction form
    20,745.52/30,986.09 = 18,768.16/x
  3. Step 3: Cross multiply
    20,745.52x = 30,986.09 × 18,768.16
  4. Step 4: Simplify right side
    20,745.52x = 581,551,894.89
  5. Step 5: Solve for x
    x = 581,551,894.89/20,745.52
  6. Step 6: Final answer
    x = 28,032.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.