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Finding the Fourth Proportional to 6,405.80, 8,840.10 and 3,611.48

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Solution

The fourth proportional to 6,405.80, 8,840.10 and 3,611.48 is: 4,983.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,405.80 : 8,840.10 = 3,611.48 : x
  2. Step 2: Convert to fraction form
    6,405.80/8,840.10 = 3,611.48/x
  3. Step 3: Cross multiply
    6,405.80x = 8,840.10 × 3,611.48
  4. Step 4: Simplify right side
    6,405.80x = 31,925,844.35
  5. Step 5: Solve for x
    x = 31,925,844.35/6,405.80
  6. Step 6: Final answer
    x = 4,983.90

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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.