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Finding the Fourth Proportional to 709.28, 978.75 and 394.53

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Solution

The fourth proportional to 709.28, 978.75 and 394.53 is: 544.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.28 : 978.75 = 394.53 : x
  2. Step 2: Convert to fraction form
    709.28/978.75 = 394.53/x
  3. Step 3: Cross multiply
    709.28x = 978.75 × 394.53
  4. Step 4: Simplify right side
    709.28x = 386,146.24
  5. Step 5: Solve for x
    x = 386,146.24/709.28
  6. Step 6: Final answer
    x = 544.42

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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.