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Finding the Fourth Proportional to 313.81, 470.80 and 131.20

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Solution

The fourth proportional to 313.81, 470.80 and 131.20 is: 196.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.81 : 470.80 = 131.20 : x
  2. Step 2: Convert to fraction form
    313.81/470.80 = 131.20/x
  3. Step 3: Cross multiply
    313.81x = 470.80 × 131.20
  4. Step 4: Simplify right side
    313.81x = 61,769.86
  5. Step 5: Solve for x
    x = 61,769.86/313.81
  6. Step 6: Final answer
    x = 196.84

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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.