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Finding the Fourth Proportional to 6,939.86, 9,576.60 and 3,955.28

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Solution

The fourth proportional to 6,939.86, 9,576.60 and 3,955.28 is: 5,458.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,939.86 : 9,576.60 = 3,955.28 : x
  2. Step 2: Convert to fraction form
    6,939.86/9,576.60 = 3,955.28/x
  3. Step 3: Cross multiply
    6,939.86x = 9,576.60 × 3,955.28
  4. Step 4: Simplify right side
    6,939.86x = 37,878,134.45
  5. Step 5: Solve for x
    x = 37,878,134.45/6,939.86
  6. Step 6: Final answer
    x = 5,458.05

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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.