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Finding the Fourth Proportional to 313.76, 470.48 and 121.26

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Solution

The fourth proportional to 313.76, 470.48 and 121.26 is: 181.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.76 : 470.48 = 121.26 : x
  2. Step 2: Convert to fraction form
    313.76/470.48 = 121.26/x
  3. Step 3: Cross multiply
    313.76x = 470.48 × 121.26
  4. Step 4: Simplify right side
    313.76x = 57,050.40
  5. Step 5: Solve for x
    x = 57,050.40/313.76
  6. Step 6: Final answer
    x = 181.83

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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.