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Finding the Fourth Proportional to 1,078.27, 1,617.60 and 667.87

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Solution

The fourth proportional to 1,078.27, 1,617.60 and 667.87 is: 1,001.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.27 : 1,617.60 = 667.87 : x
  2. Step 2: Convert to fraction form
    1,078.27/1,617.60 = 667.87/x
  3. Step 3: Cross multiply
    1,078.27x = 1,617.60 × 667.87
  4. Step 4: Simplify right side
    1,078.27x = 1,080,346.51
  5. Step 5: Solve for x
    x = 1,080,346.51/1,078.27
  6. Step 6: Final answer
    x = 1,001.93

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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.