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Finding the Fourth Proportional to 313.78, 470.36 and 131.30

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Solution

The fourth proportional to 313.78, 470.36 and 131.30 is: 196.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.78 : 470.36 = 131.30 : x
  2. Step 2: Convert to fraction form
    313.78/470.36 = 131.30/x
  3. Step 3: Cross multiply
    313.78x = 470.36 × 131.30
  4. Step 4: Simplify right side
    313.78x = 61,758.27
  5. Step 5: Solve for x
    x = 61,758.27/313.78
  6. Step 6: Final answer
    x = 196.82

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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.