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Finding the Fourth Proportional to 472.26, 708.18 and 420.96

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Solution

The fourth proportional to 472.26, 708.18 and 420.96 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.26 : 708.18 = 420.96 : x
  2. Step 2: Convert to fraction form
    472.26/708.18 = 420.96/x
  3. Step 3: Cross multiply
    472.26x = 708.18 × 420.96
  4. Step 4: Simplify right side
    472.26x = 298,115.45
  5. Step 5: Solve for x
    x = 298,115.45/472.26
  6. Step 6: Final answer
    x = 631.25

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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.