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Finding the Fourth Proportional to 318.68, 477.78 and 231.98

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Solution

The fourth proportional to 318.68, 477.78 and 231.98 is: 347.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.68 : 477.78 = 231.98 : x
  2. Step 2: Convert to fraction form
    318.68/477.78 = 231.98/x
  3. Step 3: Cross multiply
    318.68x = 477.78 × 231.98
  4. Step 4: Simplify right side
    318.68x = 110,835.40
  5. Step 5: Solve for x
    x = 110,835.40/318.68
  6. Step 6: Final answer
    x = 347.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.