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Finding the Fourth Proportional to 275.26, 412.26 and 138.40

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Solution

The fourth proportional to 275.26, 412.26 and 138.40 is: 207.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.26 : 412.26 = 138.40 : x
  2. Step 2: Convert to fraction form
    275.26/412.26 = 138.40/x
  3. Step 3: Cross multiply
    275.26x = 412.26 × 138.40
  4. Step 4: Simplify right side
    275.26x = 57,056.78
  5. Step 5: Solve for x
    x = 57,056.78/275.26
  6. Step 6: Final answer
    x = 207.28

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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.