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Finding the Fourth Proportional to 488.15, 730.49 and 455.57

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Solution

The fourth proportional to 488.15, 730.49 and 455.57 is: 681.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.15 : 730.49 = 455.57 : x
  2. Step 2: Convert to fraction form
    488.15/730.49 = 455.57/x
  3. Step 3: Cross multiply
    488.15x = 730.49 × 455.57
  4. Step 4: Simplify right side
    488.15x = 332,786.14
  5. Step 5: Solve for x
    x = 332,786.14/488.15
  6. Step 6: Final answer
    x = 681.72

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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.