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Finding the Fourth Proportional to 445.70, 672.88 and 443.30

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Solution

The fourth proportional to 445.70, 672.88 and 443.30 is: 669.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.70 : 672.88 = 443.30 : x
  2. Step 2: Convert to fraction form
    445.70/672.88 = 443.30/x
  3. Step 3: Cross multiply
    445.70x = 672.88 × 443.30
  4. Step 4: Simplify right side
    445.70x = 298,285.49
  5. Step 5: Solve for x
    x = 298,285.49/445.70
  6. Step 6: Final answer
    x = 669.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.