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Finding the Fourth Proportional to 1,980.81, 2,971.76 and 826.29

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Solution

The fourth proportional to 1,980.81, 2,971.76 and 826.29 is: 1,239.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.81 : 2,971.76 = 826.29 : x
  2. Step 2: Convert to fraction form
    1,980.81/2,971.76 = 826.29/x
  3. Step 3: Cross multiply
    1,980.81x = 2,971.76 × 826.29
  4. Step 4: Simplify right side
    1,980.81x = 2,455,531.44
  5. Step 5: Solve for x
    x = 2,455,531.44/1,980.81
  6. Step 6: Final answer
    x = 1,239.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.