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Finding the Fourth Proportional to 1,659.74, 2,290.64 and 1,217.79

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Solution

The fourth proportional to 1,659.74, 2,290.64 and 1,217.79 is: 1,680.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.74 : 2,290.64 = 1,217.79 : x
  2. Step 2: Convert to fraction form
    1,659.74/2,290.64 = 1,217.79/x
  3. Step 3: Cross multiply
    1,659.74x = 2,290.64 × 1,217.79
  4. Step 4: Simplify right side
    1,659.74x = 2,789,512.40
  5. Step 5: Solve for x
    x = 2,789,512.40/1,659.74
  6. Step 6: Final answer
    x = 1,680.70

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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.