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Finding the Fourth Proportional to 285.51, 428.21 and 131.48

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Solution

The fourth proportional to 285.51, 428.21 and 131.48 is: 197.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.51 : 428.21 = 131.48 : x
  2. Step 2: Convert to fraction form
    285.51/428.21 = 131.48/x
  3. Step 3: Cross multiply
    285.51x = 428.21 × 131.48
  4. Step 4: Simplify right side
    285.51x = 56,298.25
  5. Step 5: Solve for x
    x = 56,298.25/285.51
  6. Step 6: Final answer
    x = 197.18

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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.