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Finding the Fourth Proportional to 1,028.94, 1,542.78 and 412.74

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Solution

The fourth proportional to 1,028.94, 1,542.78 and 412.74 is: 618.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.94 : 1,542.78 = 412.74 : x
  2. Step 2: Convert to fraction form
    1,028.94/1,542.78 = 412.74/x
  3. Step 3: Cross multiply
    1,028.94x = 1,542.78 × 412.74
  4. Step 4: Simplify right side
    1,028.94x = 636,767.02
  5. Step 5: Solve for x
    x = 636,767.02/1,028.94
  6. Step 6: Final answer
    x = 618.86

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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.