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Finding the Fourth Proportional to 1,078.99, 1,618.54 and 385.99

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Solution

The fourth proportional to 1,078.99, 1,618.54 and 385.99 is: 579.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.99 : 1,618.54 = 385.99 : x
  2. Step 2: Convert to fraction form
    1,078.99/1,618.54 = 385.99/x
  3. Step 3: Cross multiply
    1,078.99x = 1,618.54 × 385.99
  4. Step 4: Simplify right side
    1,078.99x = 624,735.24
  5. Step 5: Solve for x
    x = 624,735.24/1,078.99
  6. Step 6: Final answer
    x = 579.00

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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.