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Finding the Fourth Proportional to 1,271.75, 1,754.89 and 712.19

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Solution

The fourth proportional to 1,271.75, 1,754.89 and 712.19 is: 982.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.75 : 1,754.89 = 712.19 : x
  2. Step 2: Convert to fraction form
    1,271.75/1,754.89 = 712.19/x
  3. Step 3: Cross multiply
    1,271.75x = 1,754.89 × 712.19
  4. Step 4: Simplify right side
    1,271.75x = 1,249,815.11
  5. Step 5: Solve for x
    x = 1,249,815.11/1,271.75
  6. Step 6: Final answer
    x = 982.75

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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.