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Finding the Fourth Proportional to 1,608.64, 2,220 and 979.14

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Solution

The fourth proportional to 1,608.64, 2,220 and 979.14 is: 1,351.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.64 : 2,220 = 979.14 : x
  2. Step 2: Convert to fraction form
    1,608.64/2,220 = 979.14/x
  3. Step 3: Cross multiply
    1,608.64x = 2,220 × 979.14
  4. Step 4: Simplify right side
    1,608.64x = 2,173,690.80
  5. Step 5: Solve for x
    x = 2,173,690.80/1,608.64
  6. Step 6: Final answer
    x = 1,351.26

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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.