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Finding the Fourth Proportional to 7,159.12, 9,879.08 and 3,972.60

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Solution

The fourth proportional to 7,159.12, 9,879.08 and 3,972.60 is: 5,481.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,159.12 : 9,879.08 = 3,972.60 : x
  2. Step 2: Convert to fraction form
    7,159.12/9,879.08 = 3,972.60/x
  3. Step 3: Cross multiply
    7,159.12x = 9,879.08 × 3,972.60
  4. Step 4: Simplify right side
    7,159.12x = 39,245,633.21
  5. Step 5: Solve for x
    x = 39,245,633.21/7,159.12
  6. Step 6: Final answer
    x = 5,481.91

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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.