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Finding the Fourth Proportional to 1,659.60, 2,290.80 and 1,213.20

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Solution

The fourth proportional to 1,659.60, 2,290.80 and 1,213.20 is: 1,674.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.60 : 2,290.80 = 1,213.20 : x
  2. Step 2: Convert to fraction form
    1,659.60/2,290.80 = 1,213.20/x
  3. Step 3: Cross multiply
    1,659.60x = 2,290.80 × 1,213.20
  4. Step 4: Simplify right side
    1,659.60x = 2,779,198.56
  5. Step 5: Solve for x
    x = 2,779,198.56/1,659.60
  6. Step 6: Final answer
    x = 1,674.62

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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.