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Finding the Fourth Proportional to 6,405, 8,838.99 and 3,921

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Solution

The fourth proportional to 6,405, 8,838.99 and 3,921 is: 5,411.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,405 : 8,838.99 = 3,921 : x
  2. Step 2: Convert to fraction form
    6,405/8,838.99 = 3,921/x
  3. Step 3: Cross multiply
    6,405x = 8,838.99 × 3,921
  4. Step 4: Simplify right side
    6,405x = 34,657,679.79
  5. Step 5: Solve for x
    x = 34,657,679.79/6,405
  6. Step 6: Final answer
    x = 5,411.04

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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.