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Finding the Fourth Proportional to 443.79, 611.55 and 319.23

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Solution

The fourth proportional to 443.79, 611.55 and 319.23 is: 439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.79 : 611.55 = 319.23 : x
  2. Step 2: Convert to fraction form
    443.79/611.55 = 319.23/x
  3. Step 3: Cross multiply
    443.79x = 611.55 × 319.23
  4. Step 4: Simplify right side
    443.79x = 195,225.11
  5. Step 5: Solve for x
    x = 195,225.11/443.79
  6. Step 6: Final answer
    x = 439.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.