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Finding the Fourth Proportional to 6,438.56, 8,881.16 and 3,918.88

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Solution

The fourth proportional to 6,438.56, 8,881.16 and 3,918.88 is: 5,405.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,438.56 : 8,881.16 = 3,918.88 : x
  2. Step 2: Convert to fraction form
    6,438.56/8,881.16 = 3,918.88/x
  3. Step 3: Cross multiply
    6,438.56x = 8,881.16 × 3,918.88
  4. Step 4: Simplify right side
    6,438.56x = 34,804,200.30
  5. Step 5: Solve for x
    x = 34,804,200.30/6,438.56
  6. Step 6: Final answer
    x = 5,405.59

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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.