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Finding the Fourth Proportional to 285.72, 428.58 and 131.60

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Solution

The fourth proportional to 285.72, 428.58 and 131.60 is: 197.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.72 : 428.58 = 131.60 : x
  2. Step 2: Convert to fraction form
    285.72/428.58 = 131.60/x
  3. Step 3: Cross multiply
    285.72x = 428.58 × 131.60
  4. Step 4: Simplify right side
    285.72x = 56,398.33
  5. Step 5: Solve for x
    x = 56,398.33/285.72
  6. Step 6: Final answer
    x = 197.39

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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.