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Finding the Fourth Proportional to 511.32, 767.21 and 280.38

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Solution

The fourth proportional to 511.32, 767.21 and 280.38 is: 420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.32 : 767.21 = 280.38 : x
  2. Step 2: Convert to fraction form
    511.32/767.21 = 280.38/x
  3. Step 3: Cross multiply
    511.32x = 767.21 × 280.38
  4. Step 4: Simplify right side
    511.32x = 215,110.34
  5. Step 5: Solve for x
    x = 215,110.34/511.32
  6. Step 6: Final answer
    x = 420.70

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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.