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Finding the Fourth Proportional to 466.25, 643.45 and 308.61

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Solution

The fourth proportional to 466.25, 643.45 and 308.61 is: 425.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.25 : 643.45 = 308.61 : x
  2. Step 2: Convert to fraction form
    466.25/643.45 = 308.61/x
  3. Step 3: Cross multiply
    466.25x = 643.45 × 308.61
  4. Step 4: Simplify right side
    466.25x = 198,573.08
  5. Step 5: Solve for x
    x = 198,573.08/466.25
  6. Step 6: Final answer
    x = 425.90

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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.