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Finding the Fourth Proportional to 6,639.60, 9,945.90 and 5,326.32

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Solution

The fourth proportional to 6,639.60, 9,945.90 and 5,326.32 is: 7,978.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.60 : 9,945.90 = 5,326.32 : x
  2. Step 2: Convert to fraction form
    6,639.60/9,945.90 = 5,326.32/x
  3. Step 3: Cross multiply
    6,639.60x = 9,945.90 × 5,326.32
  4. Step 4: Simplify right side
    6,639.60x = 52,975,046.09
  5. Step 5: Solve for x
    x = 52,975,046.09/6,639.60
  6. Step 6: Final answer
    x = 7,978.65

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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.