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Finding the Fourth Proportional to 20,550.40, 30,825.60 and 19,686.40

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Solution

The fourth proportional to 20,550.40, 30,825.60 and 19,686.40 is: 29,529.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,550.40 : 30,825.60 = 19,686.40 : x
  2. Step 2: Convert to fraction form
    20,550.40/30,825.60 = 19,686.40/x
  3. Step 3: Cross multiply
    20,550.40x = 30,825.60 × 19,686.40
  4. Step 4: Simplify right side
    20,550.40x = 606,845,091.84
  5. Step 5: Solve for x
    x = 606,845,091.84/20,550.40
  6. Step 6: Final answer
    x = 29,529.60

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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.