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Finding the Fourth Proportional to 505.26, 758.16 and 485.28

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Solution

The fourth proportional to 505.26, 758.16 and 485.28 is: 728.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.26 : 758.16 = 485.28 : x
  2. Step 2: Convert to fraction form
    505.26/758.16 = 485.28/x
  3. Step 3: Cross multiply
    505.26x = 758.16 × 485.28
  4. Step 4: Simplify right side
    505.26x = 367,919.88
  5. Step 5: Solve for x
    x = 367,919.88/505.26
  6. Step 6: Final answer
    x = 728.18

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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.