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Finding the Fourth Proportional to 710.81, 980.91 and 396.09

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Solution

The fourth proportional to 710.81, 980.91 and 396.09 is: 546.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.81 : 980.91 = 396.09 : x
  2. Step 2: Convert to fraction form
    710.81/980.91 = 396.09/x
  3. Step 3: Cross multiply
    710.81x = 980.91 × 396.09
  4. Step 4: Simplify right side
    710.81x = 388,524.32
  5. Step 5: Solve for x
    x = 388,524.32/710.81
  6. Step 6: Final answer
    x = 546.59

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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.