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Finding the Fourth Proportional to 511.68, 767.60 and 320.64

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Solution

The fourth proportional to 511.68, 767.60 and 320.64 is: 481.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.68 : 767.60 = 320.64 : x
  2. Step 2: Convert to fraction form
    511.68/767.60 = 320.64/x
  3. Step 3: Cross multiply
    511.68x = 767.60 × 320.64
  4. Step 4: Simplify right side
    511.68x = 246,123.26
  5. Step 5: Solve for x
    x = 246,123.26/511.68
  6. Step 6: Final answer
    x = 481.01

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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.