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Finding the Fourth Proportional to 1,712.26, 2,568.40 and 686.26

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Solution

The fourth proportional to 1,712.26, 2,568.40 and 686.26 is: 1,029.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,712.26 : 2,568.40 = 686.26 : x
  2. Step 2: Convert to fraction form
    1,712.26/2,568.40 = 686.26/x
  3. Step 3: Cross multiply
    1,712.26x = 2,568.40 × 686.26
  4. Step 4: Simplify right side
    1,712.26x = 1,762,590.18
  5. Step 5: Solve for x
    x = 1,762,590.18/1,712.26
  6. Step 6: Final answer
    x = 1,029.39

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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.