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Finding the Fourth Proportional to 1,078.12, 1,616.94 and 308.68

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Solution

The fourth proportional to 1,078.12, 1,616.94 and 308.68 is: 462.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.12 : 1,616.94 = 308.68 : x
  2. Step 2: Convert to fraction form
    1,078.12/1,616.94 = 308.68/x
  3. Step 3: Cross multiply
    1,078.12x = 1,616.94 × 308.68
  4. Step 4: Simplify right side
    1,078.12x = 499,117.04
  5. Step 5: Solve for x
    x = 499,117.04/1,078.12
  6. Step 6: Final answer
    x = 462.95

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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.