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Finding the Fourth Proportional to 503.20, 755.28 and 259.90

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Solution

The fourth proportional to 503.20, 755.28 and 259.90 is: 390.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.20 : 755.28 = 259.90 : x
  2. Step 2: Convert to fraction form
    503.20/755.28 = 259.90/x
  3. Step 3: Cross multiply
    503.20x = 755.28 × 259.90
  4. Step 4: Simplify right side
    503.20x = 196,297.27
  5. Step 5: Solve for x
    x = 196,297.27/503.20
  6. Step 6: Final answer
    x = 390.10

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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.