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Finding the Fourth Proportional to 503.55, 694.31 and 378.81

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Solution

The fourth proportional to 503.55, 694.31 and 378.81 is: 522.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.55 : 694.31 = 378.81 : x
  2. Step 2: Convert to fraction form
    503.55/694.31 = 378.81/x
  3. Step 3: Cross multiply
    503.55x = 694.31 × 378.81
  4. Step 4: Simplify right side
    503.55x = 263,009.68
  5. Step 5: Solve for x
    x = 263,009.68/503.55
  6. Step 6: Final answer
    x = 522.31

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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.