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Finding the Fourth Proportional to 511.81, 767.54 and 280.65

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Solution

The fourth proportional to 511.81, 767.54 and 280.65 is: 420.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.81 : 767.54 = 280.65 : x
  2. Step 2: Convert to fraction form
    511.81/767.54 = 280.65/x
  3. Step 3: Cross multiply
    511.81x = 767.54 × 280.65
  4. Step 4: Simplify right side
    511.81x = 215,410.10
  5. Step 5: Solve for x
    x = 215,410.10/511.81
  6. Step 6: Final answer
    x = 420.88

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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.