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Finding the Fourth Proportional to 709.38, 978.91 and 443.43

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Solution

The fourth proportional to 709.38, 978.91 and 443.43 is: 611.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.38 : 978.91 = 443.43 : x
  2. Step 2: Convert to fraction form
    709.38/978.91 = 443.43/x
  3. Step 3: Cross multiply
    709.38x = 978.91 × 443.43
  4. Step 4: Simplify right side
    709.38x = 434,076.95
  5. Step 5: Solve for x
    x = 434,076.95/709.38
  6. Step 6: Final answer
    x = 611.91

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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.