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Finding the Fourth Proportional to 709.11, 978.55 and 394.37

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Solution

The fourth proportional to 709.11, 978.55 and 394.37 is: 544.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.11 : 978.55 = 394.37 : x
  2. Step 2: Convert to fraction form
    709.11/978.55 = 394.37/x
  3. Step 3: Cross multiply
    709.11x = 978.55 × 394.37
  4. Step 4: Simplify right side
    709.11x = 385,910.76
  5. Step 5: Solve for x
    x = 385,910.76/709.11
  6. Step 6: Final answer
    x = 544.22

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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.