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Finding the Fourth Proportional to 308.58, 425.79 and 210.21

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Solution

The fourth proportional to 308.58, 425.79 and 210.21 is: 290.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.58 : 425.79 = 210.21 : x
  2. Step 2: Convert to fraction form
    308.58/425.79 = 210.21/x
  3. Step 3: Cross multiply
    308.58x = 425.79 × 210.21
  4. Step 4: Simplify right side
    308.58x = 89,505.32
  5. Step 5: Solve for x
    x = 89,505.32/308.58
  6. Step 6: Final answer
    x = 290.06

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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.