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Finding the Fourth Proportional to 709.31, 978.82 and 394.52

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Solution

The fourth proportional to 709.31, 978.82 and 394.52 is: 544.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.31 : 978.82 = 394.52 : x
  2. Step 2: Convert to fraction form
    709.31/978.82 = 394.52/x
  3. Step 3: Cross multiply
    709.31x = 978.82 × 394.52
  4. Step 4: Simplify right side
    709.31x = 386,159.76
  5. Step 5: Solve for x
    x = 386,159.76/709.31
  6. Step 6: Final answer
    x = 544.41

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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.