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Finding the Fourth Proportional to 285.08, 427.08 and 140.90

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Solution

The fourth proportional to 285.08, 427.08 and 140.90 is: 211.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.08 : 427.08 = 140.90 : x
  2. Step 2: Convert to fraction form
    285.08/427.08 = 140.90/x
  3. Step 3: Cross multiply
    285.08x = 427.08 × 140.90
  4. Step 4: Simplify right side
    285.08x = 60,175.57
  5. Step 5: Solve for x
    x = 60,175.57/285.08
  6. Step 6: Final answer
    x = 211.08

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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.