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Finding the Fourth Proportional to 6,666.90, 9,201.60 and 3,978.78

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Solution

The fourth proportional to 6,666.90, 9,201.60 and 3,978.78 is: 5,491.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,666.90 : 9,201.60 = 3,978.78 : x
  2. Step 2: Convert to fraction form
    6,666.90/9,201.60 = 3,978.78/x
  3. Step 3: Cross multiply
    6,666.90x = 9,201.60 × 3,978.78
  4. Step 4: Simplify right side
    6,666.90x = 36,611,142.05
  5. Step 5: Solve for x
    x = 36,611,142.05/6,666.90
  6. Step 6: Final answer
    x = 5,491.48

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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.