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Finding the Fourth Proportional to 488.21, 730.55 and 455.61

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Solution

The fourth proportional to 488.21, 730.55 and 455.61 is: 681.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.21 : 730.55 = 455.61 : x
  2. Step 2: Convert to fraction form
    488.21/730.55 = 455.61/x
  3. Step 3: Cross multiply
    488.21x = 730.55 × 455.61
  4. Step 4: Simplify right side
    488.21x = 332,843.61
  5. Step 5: Solve for x
    x = 332,843.61/488.21
  6. Step 6: Final answer
    x = 681.77

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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.