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Finding the Fourth Proportional to 505.41, 697.44 and 318.84

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Solution

The fourth proportional to 505.41, 697.44 and 318.84 is: 439.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.41 : 697.44 = 318.84 : x
  2. Step 2: Convert to fraction form
    505.41/697.44 = 318.84/x
  3. Step 3: Cross multiply
    505.41x = 697.44 × 318.84
  4. Step 4: Simplify right side
    505.41x = 222,371.77
  5. Step 5: Solve for x
    x = 222,371.77/505.41
  6. Step 6: Final answer
    x = 439.98

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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.