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Finding the Fourth Proportional to 6,139.80, 8,478.10 and 3,905.64

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Solution

The fourth proportional to 6,139.80, 8,478.10 and 3,905.64 is: 5,393.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,139.80 : 8,478.10 = 3,905.64 : x
  2. Step 2: Convert to fraction form
    6,139.80/8,478.10 = 3,905.64/x
  3. Step 3: Cross multiply
    6,139.80x = 8,478.10 × 3,905.64
  4. Step 4: Simplify right side
    6,139.80x = 33,112,406.48
  5. Step 5: Solve for x
    x = 33,112,406.48/6,139.80
  6. Step 6: Final answer
    x = 5,393.08

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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.