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Finding the Fourth Proportional to 285.95, 428.99 and 141.63

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Solution

The fourth proportional to 285.95, 428.99 and 141.63 is: 212.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.95 : 428.99 = 141.63 : x
  2. Step 2: Convert to fraction form
    285.95/428.99 = 141.63/x
  3. Step 3: Cross multiply
    285.95x = 428.99 × 141.63
  4. Step 4: Simplify right side
    285.95x = 60,757.15
  5. Step 5: Solve for x
    x = 60,757.15/285.95
  6. Step 6: Final answer
    x = 212.48

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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.