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Finding the Fourth Proportional to 678.28, 1,017.38 and 293.48

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Solution

The fourth proportional to 678.28, 1,017.38 and 293.48 is: 440.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.28 : 1,017.38 = 293.48 : x
  2. Step 2: Convert to fraction form
    678.28/1,017.38 = 293.48/x
  3. Step 3: Cross multiply
    678.28x = 1,017.38 × 293.48
  4. Step 4: Simplify right side
    678.28x = 298,580.68
  5. Step 5: Solve for x
    x = 298,580.68/678.28
  6. Step 6: Final answer
    x = 440.20

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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.