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Finding the Fourth Proportional to 1,969.34, 2,717.79 and 1,129.91

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Solution

The fourth proportional to 1,969.34, 2,717.79 and 1,129.91 is: 1,559.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,969.34 : 2,717.79 = 1,129.91 : x
  2. Step 2: Convert to fraction form
    1,969.34/2,717.79 = 1,129.91/x
  3. Step 3: Cross multiply
    1,969.34x = 2,717.79 × 1,129.91
  4. Step 4: Simplify right side
    1,969.34x = 3,070,858.10
  5. Step 5: Solve for x
    x = 3,070,858.10/1,969.34
  6. Step 6: Final answer
    x = 1,559.33

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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.