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Finding the Fourth Proportional to 6,608.79, 9,120.87 and 4,220.98

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Solution

The fourth proportional to 6,608.79, 9,120.87 and 4,220.98 is: 5,825.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,608.79 : 9,120.87 = 4,220.98 : x
  2. Step 2: Convert to fraction form
    6,608.79/9,120.87 = 4,220.98/x
  3. Step 3: Cross multiply
    6,608.79x = 9,120.87 × 4,220.98
  4. Step 4: Simplify right side
    6,608.79x = 38,498,987.05
  5. Step 5: Solve for x
    x = 38,498,987.05/6,608.79
  6. Step 6: Final answer
    x = 5,825.42

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Half scale
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Double scale
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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.