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Finding the Fourth Proportional to 1,078.12, 1,617.62 and 384.92

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Solution

The fourth proportional to 1,078.12, 1,617.62 and 384.92 is: 577.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.12 : 1,617.62 = 384.92 : x
  2. Step 2: Convert to fraction form
    1,078.12/1,617.62 = 384.92/x
  3. Step 3: Cross multiply
    1,078.12x = 1,617.62 × 384.92
  4. Step 4: Simplify right side
    1,078.12x = 622,654.29
  5. Step 5: Solve for x
    x = 622,654.29/1,078.12
  6. Step 6: Final answer
    x = 577.54

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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.