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Finding the Fourth Proportional to 1,609.74, 2,221.62 and 980.58

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Solution

The fourth proportional to 1,609.74, 2,221.62 and 980.58 is: 1,353.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.74 : 2,221.62 = 980.58 : x
  2. Step 2: Convert to fraction form
    1,609.74/2,221.62 = 980.58/x
  3. Step 3: Cross multiply
    1,609.74x = 2,221.62 × 980.58
  4. Step 4: Simplify right side
    1,609.74x = 2,178,476.14
  5. Step 5: Solve for x
    x = 2,178,476.14/1,609.74
  6. Step 6: Final answer
    x = 1,353.31

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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.