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Finding the Fourth Proportional to 285.77, 428.31 and 131.48

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Solution

The fourth proportional to 285.77, 428.31 and 131.48 is: 197.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.77 : 428.31 = 131.48 : x
  2. Step 2: Convert to fraction form
    285.77/428.31 = 131.48/x
  3. Step 3: Cross multiply
    285.77x = 428.31 × 131.48
  4. Step 4: Simplify right side
    285.77x = 56,315.27
  5. Step 5: Solve for x
    x = 56,315.27/285.77
  6. Step 6: Final answer
    x = 197.06

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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.