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Finding the Fourth Proportional to 503.79, 755.68 and 138.57

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Solution

The fourth proportional to 503.79, 755.68 and 138.57 is: 207.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.79 : 755.68 = 138.57 : x
  2. Step 2: Convert to fraction form
    503.79/755.68 = 138.57/x
  3. Step 3: Cross multiply
    503.79x = 755.68 × 138.57
  4. Step 4: Simplify right side
    503.79x = 104,714.58
  5. Step 5: Solve for x
    x = 104,714.58/503.79
  6. Step 6: Final answer
    x = 207.85

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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.