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Finding the Fourth Proportional to 1,078.57, 1,617.99 and 385.09

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Solution

The fourth proportional to 1,078.57, 1,617.99 and 385.09 is: 577.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.57 : 1,617.99 = 385.09 : x
  2. Step 2: Convert to fraction form
    1,078.57/1,617.99 = 385.09/x
  3. Step 3: Cross multiply
    1,078.57x = 1,617.99 × 385.09
  4. Step 4: Simplify right side
    1,078.57x = 623,071.77
  5. Step 5: Solve for x
    x = 623,071.77/1,078.57
  6. Step 6: Final answer
    x = 577.68

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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.