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Finding the Fourth Proportional to 1,028.38, 1,543 and 412.52

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Solution

The fourth proportional to 1,028.38, 1,543 and 412.52 is: 618.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.38 : 1,543 = 412.52 : x
  2. Step 2: Convert to fraction form
    1,028.38/1,543 = 412.52/x
  3. Step 3: Cross multiply
    1,028.38x = 1,543 × 412.52
  4. Step 4: Simplify right side
    1,028.38x = 636,518.36
  5. Step 5: Solve for x
    x = 636,518.36/1,028.38
  6. Step 6: Final answer
    x = 618.95

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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.