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Finding the Fourth Proportional to 285.63, 428.14 and 131.32

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Solution

The fourth proportional to 285.63, 428.14 and 131.32 is: 196.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.63 : 428.14 = 131.32 : x
  2. Step 2: Convert to fraction form
    285.63/428.14 = 131.32/x
  3. Step 3: Cross multiply
    285.63x = 428.14 × 131.32
  4. Step 4: Simplify right side
    285.63x = 56,223.31
  5. Step 5: Solve for x
    x = 56,223.31/285.63
  6. Step 6: Final answer
    x = 196.84

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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.