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Finding the Fourth Proportional to 503.87, 698.87 and 485.42

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Solution

The fourth proportional to 503.87, 698.87 and 485.42 is: 673.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.87 : 698.87 = 485.42 : x
  2. Step 2: Convert to fraction form
    503.87/698.87 = 485.42/x
  3. Step 3: Cross multiply
    503.87x = 698.87 × 485.42
  4. Step 4: Simplify right side
    503.87x = 339,243.19
  5. Step 5: Solve for x
    x = 339,243.19/503.87
  6. Step 6: Final answer
    x = 673.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.