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Finding the Fourth Proportional to 1,971.81, 2,721.13 and 1,087.63

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Solution

The fourth proportional to 1,971.81, 2,721.13 and 1,087.63 is: 1,500.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.81 : 2,721.13 = 1,087.63 : x
  2. Step 2: Convert to fraction form
    1,971.81/2,721.13 = 1,087.63/x
  3. Step 3: Cross multiply
    1,971.81x = 2,721.13 × 1,087.63
  4. Step 4: Simplify right side
    1,971.81x = 2,959,573.10
  5. Step 5: Solve for x
    x = 2,959,573.10/1,971.81
  6. Step 6: Final answer
    x = 1,500.94

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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.