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Finding the Fourth Proportional to 20,682.89, 30,790.40 and 20,559.87

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Solution

The fourth proportional to 20,682.89, 30,790.40 and 20,559.87 is: 30,607.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,682.89 : 30,790.40 = 20,559.87 : x
  2. Step 2: Convert to fraction form
    20,682.89/30,790.40 = 20,559.87/x
  3. Step 3: Cross multiply
    20,682.89x = 30,790.40 × 20,559.87
  4. Step 4: Simplify right side
    20,682.89x = 633,046,518.45
  5. Step 5: Solve for x
    x = 633,046,518.45/20,682.89
  6. Step 6: Final answer
    x = 30,607.26

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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.