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Finding the Fourth Proportional to 6,511.78, 8,985.90 and 3,679.48

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Solution

The fourth proportional to 6,511.78, 8,985.90 and 3,679.48 is: 5,077.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,511.78 : 8,985.90 = 3,679.48 : x
  2. Step 2: Convert to fraction form
    6,511.78/8,985.90 = 3,679.48/x
  3. Step 3: Cross multiply
    6,511.78x = 8,985.90 × 3,679.48
  4. Step 4: Simplify right side
    6,511.78x = 33,063,439.33
  5. Step 5: Solve for x
    x = 33,063,439.33/6,511.78
  6. Step 6: Final answer
    x = 5,077.48

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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.