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Finding the Fourth Proportional to 285.67, 428.55 and 123.49

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Solution

The fourth proportional to 285.67, 428.55 and 123.49 is: 185.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.67 : 428.55 = 123.49 : x
  2. Step 2: Convert to fraction form
    285.67/428.55 = 123.49/x
  3. Step 3: Cross multiply
    285.67x = 428.55 × 123.49
  4. Step 4: Simplify right side
    285.67x = 52,921.64
  5. Step 5: Solve for x
    x = 52,921.64/285.67
  6. Step 6: Final answer
    x = 185.25

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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.