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Finding the Fourth Proportional to 503.49, 755.12 and 138.20

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Solution

The fourth proportional to 503.49, 755.12 and 138.20 is: 207.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.49 : 755.12 = 138.20 : x
  2. Step 2: Convert to fraction form
    503.49/755.12 = 138.20/x
  3. Step 3: Cross multiply
    503.49x = 755.12 × 138.20
  4. Step 4: Simplify right side
    503.49x = 104,354.15
  5. Step 5: Solve for x
    x = 104,354.15/503.49
  6. Step 6: Final answer
    x = 207.26

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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.