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Finding the Fourth Proportional to 286, 428.28 and 155.60

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Solution

The fourth proportional to 286, 428.28 and 155.60 is: 233.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    286 : 428.28 = 155.60 : x
  2. Step 2: Convert to fraction form
    286/428.28 = 155.60/x
  3. Step 3: Cross multiply
    286x = 428.28 × 155.60
  4. Step 4: Simplify right side
    286x = 66,640.37
  5. Step 5: Solve for x
    x = 66,640.37/286
  6. Step 6: Final answer
    x = 233.01

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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.