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Finding the Fourth Proportional to 6,391.61, 9,576.93 and 3,921.21

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Solution

The fourth proportional to 6,391.61, 9,576.93 and 3,921.21 is: 5,875.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.61 : 9,576.93 = 3,921.21 : x
  2. Step 2: Convert to fraction form
    6,391.61/9,576.93 = 3,921.21/x
  3. Step 3: Cross multiply
    6,391.61x = 9,576.93 × 3,921.21
  4. Step 4: Simplify right side
    6,391.61x = 37,553,168.39
  5. Step 5: Solve for x
    x = 37,553,168.39/6,391.61
  6. Step 6: Final answer
    x = 5,875.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.