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Finding the Fourth Proportional to 1,858, 2,786.66 and 687.82

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Solution

The fourth proportional to 1,858, 2,786.66 and 687.82 is: 1,031.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858 : 2,786.66 = 687.82 : x
  2. Step 2: Convert to fraction form
    1,858/2,786.66 = 687.82/x
  3. Step 3: Cross multiply
    1,858x = 2,786.66 × 687.82
  4. Step 4: Simplify right side
    1,858x = 1,916,720.48
  5. Step 5: Solve for x
    x = 1,916,720.48/1,858
  6. Step 6: Final answer
    x = 1,031.60

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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.