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Finding the Fourth Proportional to 6,485.70, 9,728.55 and 2,103.60

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Solution

The fourth proportional to 6,485.70, 9,728.55 and 2,103.60 is: 3,155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,485.70 : 9,728.55 = 2,103.60 : x
  2. Step 2: Convert to fraction form
    6,485.70/9,728.55 = 2,103.60/x
  3. Step 3: Cross multiply
    6,485.70x = 9,728.55 × 2,103.60
  4. Step 4: Simplify right side
    6,485.70x = 20,464,977.78
  5. Step 5: Solve for x
    x = 20,464,977.78/6,485.70
  6. Step 6: Final answer
    x = 3,155.40

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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.