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Finding the Fourth Proportional to 20,880.35, 31,321.80 and 8,400.35

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Solution

The fourth proportional to 20,880.35, 31,321.80 and 8,400.35 is: 12,601.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.35 : 31,321.80 = 8,400.35 : x
  2. Step 2: Convert to fraction form
    20,880.35/31,321.80 = 8,400.35/x
  3. Step 3: Cross multiply
    20,880.35x = 31,321.80 × 8,400.35
  4. Step 4: Simplify right side
    20,880.35x = 263,113,926.02
  5. Step 5: Solve for x
    x = 263,113,926.02/20,880.35
  6. Step 6: Final answer
    x = 12,601.03

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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.