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Finding the Fourth Proportional to 709.36, 978.85 and 394.62

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Solution

The fourth proportional to 709.36, 978.85 and 394.62 is: 544.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.36 : 978.85 = 394.62 : x
  2. Step 2: Convert to fraction form
    709.36/978.85 = 394.62/x
  3. Step 3: Cross multiply
    709.36x = 978.85 × 394.62
  4. Step 4: Simplify right side
    709.36x = 386,275.02
  5. Step 5: Solve for x
    x = 386,275.02/709.36
  6. Step 6: Final answer
    x = 544.54

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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.