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Finding the Fourth Proportional to 285.89, 428.68 and 131.93

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Solution

The fourth proportional to 285.89, 428.68 and 131.93 is: 197.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.89 : 428.68 = 131.93 : x
  2. Step 2: Convert to fraction form
    285.89/428.68 = 131.93/x
  3. Step 3: Cross multiply
    285.89x = 428.68 × 131.93
  4. Step 4: Simplify right side
    285.89x = 56,555.09
  5. Step 5: Solve for x
    x = 56,555.09/285.89
  6. Step 6: Final answer
    x = 197.82

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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.