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Finding the Fourth Proportional to 505.51, 696.85 and 308.89

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Solution

The fourth proportional to 505.51, 696.85 and 308.89 is: 425.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.51 : 696.85 = 308.89 : x
  2. Step 2: Convert to fraction form
    505.51/696.85 = 308.89/x
  3. Step 3: Cross multiply
    505.51x = 696.85 × 308.89
  4. Step 4: Simplify right side
    505.51x = 215,249.22
  5. Step 5: Solve for x
    x = 215,249.22/505.51
  6. Step 6: Final answer
    x = 425.81

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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.