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Finding the Fourth Proportional to 20,455.81, 30,684.08 and 6,415.54

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Solution

The fourth proportional to 20,455.81, 30,684.08 and 6,415.54 is: 9,623.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.81 : 30,684.08 = 6,415.54 : x
  2. Step 2: Convert to fraction form
    20,455.81/30,684.08 = 6,415.54/x
  3. Step 3: Cross multiply
    20,455.81x = 30,684.08 × 6,415.54
  4. Step 4: Simplify right side
    20,455.81x = 196,854,881.93
  5. Step 5: Solve for x
    x = 196,854,881.93/20,455.81
  6. Step 6: Final answer
    x = 9,623.42

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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.