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Finding the Fourth Proportional to 471.72, 709.86 and 426.96

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Solution

The fourth proportional to 471.72, 709.86 and 426.96 is: 642.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.72 : 709.86 = 426.96 : x
  2. Step 2: Convert to fraction form
    471.72/709.86 = 426.96/x
  3. Step 3: Cross multiply
    471.72x = 709.86 × 426.96
  4. Step 4: Simplify right side
    471.72x = 303,081.83
  5. Step 5: Solve for x
    x = 303,081.83/471.72
  6. Step 6: Final answer
    x = 642.50

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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.