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Finding the Fourth Proportional to 313.72, 470.81 and 118.91

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Solution

The fourth proportional to 313.72, 470.81 and 118.91 is: 178.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.72 : 470.81 = 118.91 : x
  2. Step 2: Convert to fraction form
    313.72/470.81 = 118.91/x
  3. Step 3: Cross multiply
    313.72x = 470.81 × 118.91
  4. Step 4: Simplify right side
    313.72x = 55,981.07
  5. Step 5: Solve for x
    x = 55,981.07/313.72
  6. Step 6: Final answer
    x = 178.45

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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.