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Finding the Fourth Proportional to 505.40, 757.82 and 261.32

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Solution

The fourth proportional to 505.40, 757.82 and 261.32 is: 391.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.40 : 757.82 = 261.32 : x
  2. Step 2: Convert to fraction form
    505.40/757.82 = 261.32/x
  3. Step 3: Cross multiply
    505.40x = 757.82 × 261.32
  4. Step 4: Simplify right side
    505.40x = 198,033.52
  5. Step 5: Solve for x
    x = 198,033.52/505.40
  6. Step 6: Final answer
    x = 391.84

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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.