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Finding the Fourth Proportional to 1,980.71, 2,971.37 and 681.88

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Solution

The fourth proportional to 1,980.71, 2,971.37 and 681.88 is: 1,022.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.71 : 2,971.37 = 681.88 : x
  2. Step 2: Convert to fraction form
    1,980.71/2,971.37 = 681.88/x
  3. Step 3: Cross multiply
    1,980.71x = 2,971.37 × 681.88
  4. Step 4: Simplify right side
    1,980.71x = 2,026,117.78
  5. Step 5: Solve for x
    x = 2,026,117.78/1,980.71
  6. Step 6: Final answer
    x = 1,022.92

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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.