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Finding the Fourth Proportional to 503.92, 755.92 and 138.70

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Solution

The fourth proportional to 503.92, 755.92 and 138.70 is: 208.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.92 : 755.92 = 138.70 : x
  2. Step 2: Convert to fraction form
    503.92/755.92 = 138.70/x
  3. Step 3: Cross multiply
    503.92x = 755.92 × 138.70
  4. Step 4: Simplify right side
    503.92x = 104,846.10
  5. Step 5: Solve for x
    x = 104,846.10/503.92
  6. Step 6: Final answer
    x = 208.06

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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.