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Finding the Fourth Proportional to 505.28, 757.84 and 139.99

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Solution

The fourth proportional to 505.28, 757.84 and 139.99 is: 209.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.28 : 757.84 = 139.99 : x
  2. Step 2: Convert to fraction form
    505.28/757.84 = 139.99/x
  3. Step 3: Cross multiply
    505.28x = 757.84 × 139.99
  4. Step 4: Simplify right side
    505.28x = 106,087.78
  5. Step 5: Solve for x
    x = 106,087.78/505.28
  6. Step 6: Final answer
    x = 209.96

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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.