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Finding the Fourth Proportional to 781.44, 1,078.08 and 664.96

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Solution

The fourth proportional to 781.44, 1,078.08 and 664.96 is: 917.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.44 : 1,078.08 = 664.96 : x
  2. Step 2: Convert to fraction form
    781.44/1,078.08 = 664.96/x
  3. Step 3: Cross multiply
    781.44x = 1,078.08 × 664.96
  4. Step 4: Simplify right side
    781.44x = 716,880.08
  5. Step 5: Solve for x
    x = 716,880.08/781.44
  6. Step 6: Final answer
    x = 917.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.