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Finding the Fourth Proportional to 21,745.20, 30,404.40 and 21,745.20

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Solution

The fourth proportional to 21,745.20, 30,404.40 and 21,745.20 is: 30,404.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,745.20 : 30,404.40 = 21,745.20 : x
  2. Step 2: Convert to fraction form
    21,745.20/30,404.40 = 21,745.20/x
  3. Step 3: Cross multiply
    21,745.20x = 30,404.40 × 21,745.20
  4. Step 4: Simplify right side
    21,745.20x = 661,149,758.88
  5. Step 5: Solve for x
    x = 661,149,758.88/21,745.20
  6. Step 6: Final answer
    x = 30,404.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.