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Finding the Fourth Proportional to 478.98, 720.09 and 443.34

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Solution

The fourth proportional to 478.98, 720.09 and 443.34 is: 666.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.98 : 720.09 = 443.34 : x
  2. Step 2: Convert to fraction form
    478.98/720.09 = 443.34/x
  3. Step 3: Cross multiply
    478.98x = 720.09 × 443.34
  4. Step 4: Simplify right side
    478.98x = 319,244.70
  5. Step 5: Solve for x
    x = 319,244.70/478.98
  6. Step 6: Final answer
    x = 666.51

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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.