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Finding the Fourth Proportional to 503.60, 755.28 and 138.40

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Solution

The fourth proportional to 503.60, 755.28 and 138.40 is: 207.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.60 : 755.28 = 138.40 : x
  2. Step 2: Convert to fraction form
    503.60/755.28 = 138.40/x
  3. Step 3: Cross multiply
    503.60x = 755.28 × 138.40
  4. Step 4: Simplify right side
    503.60x = 104,530.75
  5. Step 5: Solve for x
    x = 104,530.75/503.60
  6. Step 6: Final answer
    x = 207.57

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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.