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Finding the Fourth Proportional to 709.03, 978.44 and 394.28

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Solution

The fourth proportional to 709.03, 978.44 and 394.28 is: 544.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.03 : 978.44 = 394.28 : x
  2. Step 2: Convert to fraction form
    709.03/978.44 = 394.28/x
  3. Step 3: Cross multiply
    709.03x = 978.44 × 394.28
  4. Step 4: Simplify right side
    709.03x = 385,775.42
  5. Step 5: Solve for x
    x = 385,775.42/709.03
  6. Step 6: Final answer
    x = 544.09

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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.