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Finding the Fourth Proportional to 505.89, 757.91 and 320.28

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Solution

The fourth proportional to 505.89, 757.91 and 320.28 is: 479.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.89 : 757.91 = 320.28 : x
  2. Step 2: Convert to fraction form
    505.89/757.91 = 320.28/x
  3. Step 3: Cross multiply
    505.89x = 757.91 × 320.28
  4. Step 4: Simplify right side
    505.89x = 242,741.81
  5. Step 5: Solve for x
    x = 242,741.81/505.89
  6. Step 6: Final answer
    x = 479.83

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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.