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Finding the Fourth Proportional to 505.74, 696.08 and 485.58

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Solution

The fourth proportional to 505.74, 696.08 and 485.58 is: 668.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.74 : 696.08 = 485.58 : x
  2. Step 2: Convert to fraction form
    505.74/696.08 = 485.58/x
  3. Step 3: Cross multiply
    505.74x = 696.08 × 485.58
  4. Step 4: Simplify right side
    505.74x = 338,004.69
  5. Step 5: Solve for x
    x = 338,004.69/505.74
  6. Step 6: Final answer
    x = 668.33

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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.