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Finding the Fourth Proportional to 286.89, 429.99 and 140.72

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Solution

The fourth proportional to 286.89, 429.99 and 140.72 is: 210.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.89 : 429.99 = 140.72 : x
  2. Step 2: Convert to fraction form
    286.89/429.99 = 140.72/x
  3. Step 3: Cross multiply
    286.89x = 429.99 × 140.72
  4. Step 4: Simplify right side
    286.89x = 60,506.04
  5. Step 5: Solve for x
    x = 60,506.04/286.89
  6. Step 6: Final answer
    x = 210.90

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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.