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Finding the Fourth Proportional to 285.40, 427.74 and 141.40

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Solution

The fourth proportional to 285.40, 427.74 and 141.40 is: 211.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.40 : 427.74 = 141.40 : x
  2. Step 2: Convert to fraction form
    285.40/427.74 = 141.40/x
  3. Step 3: Cross multiply
    285.40x = 427.74 × 141.40
  4. Step 4: Simplify right side
    285.40x = 60,482.44
  5. Step 5: Solve for x
    x = 60,482.44/285.40
  6. Step 6: Final answer
    x = 211.92

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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.