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Finding the Fourth Proportional to 6,489.22, 8,955.45 and 3,970.54

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Solution

The fourth proportional to 6,489.22, 8,955.45 and 3,970.54 is: 5,479.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,489.22 : 8,955.45 = 3,970.54 : x
  2. Step 2: Convert to fraction form
    6,489.22/8,955.45 = 3,970.54/x
  3. Step 3: Cross multiply
    6,489.22x = 8,955.45 × 3,970.54
  4. Step 4: Simplify right side
    6,489.22x = 35,557,972.44
  5. Step 5: Solve for x
    x = 35,557,972.44/6,489.22
  6. Step 6: Final answer
    x = 5,479.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.