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Finding the Fourth Proportional to 505.14, 696.80 and 308.61

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Solution

The fourth proportional to 505.14, 696.80 and 308.61 is: 425.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.14 : 696.80 = 308.61 : x
  2. Step 2: Convert to fraction form
    505.14/696.80 = 308.61/x
  3. Step 3: Cross multiply
    505.14x = 696.80 × 308.61
  4. Step 4: Simplify right side
    505.14x = 215,040.22
  5. Step 5: Solve for x
    x = 215,040.22/505.14
  6. Step 6: Final answer
    x = 425.71

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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.