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Finding the Fourth Proportional to 6,630.80, 9,150.60 and 3,978.32

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Solution

The fourth proportional to 6,630.80, 9,150.60 and 3,978.32 is: 5,490.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,630.80 : 9,150.60 = 3,978.32 : x
  2. Step 2: Convert to fraction form
    6,630.80/9,150.60 = 3,978.32/x
  3. Step 3: Cross multiply
    6,630.80x = 9,150.60 × 3,978.32
  4. Step 4: Simplify right side
    6,630.80x = 36,404,014.99
  5. Step 5: Solve for x
    x = 36,404,014.99/6,630.80
  6. Step 6: Final answer
    x = 5,490.14

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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.