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Finding the Fourth Proportional to 285.57, 428.04 and 141.30

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Solution

The fourth proportional to 285.57, 428.04 and 141.30 is: 211.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.57 : 428.04 = 141.30 : x
  2. Step 2: Convert to fraction form
    285.57/428.04 = 141.30/x
  3. Step 3: Cross multiply
    285.57x = 428.04 × 141.30
  4. Step 4: Simplify right side
    285.57x = 60,482.05
  5. Step 5: Solve for x
    x = 60,482.05/285.57
  6. Step 6: Final answer
    x = 211.79

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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.