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Finding the Fourth Proportional to 471.56, 707.49 and 211.78

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Solution

The fourth proportional to 471.56, 707.49 and 211.78 is: 317.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.56 : 707.49 = 211.78 : x
  2. Step 2: Convert to fraction form
    471.56/707.49 = 211.78/x
  3. Step 3: Cross multiply
    471.56x = 707.49 × 211.78
  4. Step 4: Simplify right side
    471.56x = 149,831.17
  5. Step 5: Solve for x
    x = 149,831.17/471.56
  6. Step 6: Final answer
    x = 317.74

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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.