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Finding the Fourth Proportional to 438.92, 605.56 and 308.08

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Solution

The fourth proportional to 438.92, 605.56 and 308.08 is: 425.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.92 : 605.56 = 308.08 : x
  2. Step 2: Convert to fraction form
    438.92/605.56 = 308.08/x
  3. Step 3: Cross multiply
    438.92x = 605.56 × 308.08
  4. Step 4: Simplify right side
    438.92x = 186,560.92
  5. Step 5: Solve for x
    x = 186,560.92/438.92
  6. Step 6: Final answer
    x = 425.05

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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.