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Finding the Fourth Proportional to 443.81, 663.90 and 319.65

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Solution

The fourth proportional to 443.81, 663.90 and 319.65 is: 478.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.81 : 663.90 = 319.65 : x
  2. Step 2: Convert to fraction form
    443.81/663.90 = 319.65/x
  3. Step 3: Cross multiply
    443.81x = 663.90 × 319.65
  4. Step 4: Simplify right side
    443.81x = 212,211.95
  5. Step 5: Solve for x
    x = 212,211.95/443.81
  6. Step 6: Final answer
    x = 478.16

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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.