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Finding the Fourth Proportional to 503.78, 755.60 and 138.59

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Solution

The fourth proportional to 503.78, 755.60 and 138.59 is: 207.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.78 : 755.60 = 138.59 : x
  2. Step 2: Convert to fraction form
    503.78/755.60 = 138.59/x
  3. Step 3: Cross multiply
    503.78x = 755.60 × 138.59
  4. Step 4: Simplify right side
    503.78x = 104,714.13
  5. Step 5: Solve for x
    x = 104,714.13/503.78
  6. Step 6: Final answer
    x = 207.86

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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.