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Finding the Fourth Proportional to 1,862, 2,794.28 and 646

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Solution

The fourth proportional to 1,862, 2,794.28 and 646 is: 969.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,862 : 2,794.28 = 646 : x
  2. Step 2: Convert to fraction form
    1,862/2,794.28 = 646/x
  3. Step 3: Cross multiply
    1,862x = 2,794.28 × 646
  4. Step 4: Simplify right side
    1,862x = 1,805,104.88
  5. Step 5: Solve for x
    x = 1,805,104.88/1,862
  6. Step 6: Final answer
    x = 969.44

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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.