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Finding the Fourth Proportional to 313.76, 470.02 and 191.72

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Solution

The fourth proportional to 313.76, 470.02 and 191.72 is: 287.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.76 : 470.02 = 191.72 : x
  2. Step 2: Convert to fraction form
    313.76/470.02 = 191.72/x
  3. Step 3: Cross multiply
    313.76x = 470.02 × 191.72
  4. Step 4: Simplify right side
    313.76x = 90,112.23
  5. Step 5: Solve for x
    x = 90,112.23/313.76
  6. Step 6: Final answer
    x = 287.20

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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.