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Finding the Fourth Proportional to 471.81, 651.20 and 285.31

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Solution

The fourth proportional to 471.81, 651.20 and 285.31 is: 393.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.81 : 651.20 = 285.31 : x
  2. Step 2: Convert to fraction form
    471.81/651.20 = 285.31/x
  3. Step 3: Cross multiply
    471.81x = 651.20 × 285.31
  4. Step 4: Simplify right side
    471.81x = 185,793.87
  5. Step 5: Solve for x
    x = 185,793.87/471.81
  6. Step 6: Final answer
    x = 393.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.