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Finding the Fourth Proportional to 285.84, 428.95 and 123.54

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Solution

The fourth proportional to 285.84, 428.95 and 123.54 is: 185.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.84 : 428.95 = 123.54 : x
  2. Step 2: Convert to fraction form
    285.84/428.95 = 123.54/x
  3. Step 3: Cross multiply
    285.84x = 428.95 × 123.54
  4. Step 4: Simplify right side
    285.84x = 52,989.72
  5. Step 5: Solve for x
    x = 52,989.72/285.84
  6. Step 6: Final answer
    x = 185.39

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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.