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Finding the Fourth Proportional to 313.78, 433.02 and 173.90

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Solution

The fourth proportional to 313.78, 433.02 and 173.90 is: 239.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.78 : 433.02 = 173.90 : x
  2. Step 2: Convert to fraction form
    313.78/433.02 = 173.90/x
  3. Step 3: Cross multiply
    313.78x = 433.02 × 173.90
  4. Step 4: Simplify right side
    313.78x = 75,300.01
  5. Step 5: Solve for x
    x = 75,300.01/313.78
  6. Step 6: Final answer
    x = 239.98

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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.