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Finding the Fourth Proportional to 1,078.95, 1,618.35 and 385.54

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Solution

The fourth proportional to 1,078.95, 1,618.35 and 385.54 is: 578.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.95 : 1,618.35 = 385.54 : x
  2. Step 2: Convert to fraction form
    1,078.95/1,618.35 = 385.54/x
  3. Step 3: Cross multiply
    1,078.95x = 1,618.35 × 385.54
  4. Step 4: Simplify right side
    1,078.95x = 623,936.73
  5. Step 5: Solve for x
    x = 623,936.73/1,078.95
  6. Step 6: Final answer
    x = 578.28

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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.