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Finding the Fourth Proportional to 286.07, 428.90 and 121.53

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Solution

The fourth proportional to 286.07, 428.90 and 121.53 is: 182.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.07 : 428.90 = 121.53 : x
  2. Step 2: Convert to fraction form
    286.07/428.90 = 121.53/x
  3. Step 3: Cross multiply
    286.07x = 428.90 × 121.53
  4. Step 4: Simplify right side
    286.07x = 52,125.22
  5. Step 5: Solve for x
    x = 52,125.22/286.07
  6. Step 6: Final answer
    x = 182.21

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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.