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Finding the Fourth Proportional to 1,078.34, 1,617.05 and 385.19

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Solution

The fourth proportional to 1,078.34, 1,617.05 and 385.19 is: 577.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.34 : 1,617.05 = 385.19 : x
  2. Step 2: Convert to fraction form
    1,078.34/1,617.05 = 385.19/x
  3. Step 3: Cross multiply
    1,078.34x = 1,617.05 × 385.19
  4. Step 4: Simplify right side
    1,078.34x = 622,863.40
  5. Step 5: Solve for x
    x = 622,863.40/1,078.34
  6. Step 6: Final answer
    x = 577.61

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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.