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Finding the Fourth Proportional to 285.38, 428 and 123.05

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Solution

The fourth proportional to 285.38, 428 and 123.05 is: 184.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.38 : 428 = 123.05 : x
  2. Step 2: Convert to fraction form
    285.38/428 = 123.05/x
  3. Step 3: Cross multiply
    285.38x = 428 × 123.05
  4. Step 4: Simplify right side
    285.38x = 52,663.26
  5. Step 5: Solve for x
    x = 52,663.26/285.38
  6. Step 6: Final answer
    x = 184.54

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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.