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Finding the Fourth Proportional to 443.19, 611.89 and 285.89

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Solution

The fourth proportional to 443.19, 611.89 and 285.89 is: 394.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.19 : 611.89 = 285.89 : x
  2. Step 2: Convert to fraction form
    443.19/611.89 = 285.89/x
  3. Step 3: Cross multiply
    443.19x = 611.89 × 285.89
  4. Step 4: Simplify right side
    443.19x = 174,934.05
  5. Step 5: Solve for x
    x = 174,934.05/443.19
  6. Step 6: Final answer
    x = 394.72

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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.