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Finding the Fourth Proportional to 308.47, 425.70 and 220.12

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Solution

The fourth proportional to 308.47, 425.70 and 220.12 is: 303.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.47 : 425.70 = 220.12 : x
  2. Step 2: Convert to fraction form
    308.47/425.70 = 220.12/x
  3. Step 3: Cross multiply
    308.47x = 425.70 × 220.12
  4. Step 4: Simplify right side
    308.47x = 93,705.08
  5. Step 5: Solve for x
    x = 93,705.08/308.47
  6. Step 6: Final answer
    x = 303.77

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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.