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Finding the Fourth Proportional to 511.97, 767.35 and 389.86

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Solution

The fourth proportional to 511.97, 767.35 and 389.86 is: 584.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.97 : 767.35 = 389.86 : x
  2. Step 2: Convert to fraction form
    511.97/767.35 = 389.86/x
  3. Step 3: Cross multiply
    511.97x = 767.35 × 389.86
  4. Step 4: Simplify right side
    511.97x = 299,159.07
  5. Step 5: Solve for x
    x = 299,159.07/511.97
  6. Step 6: Final answer
    x = 584.33

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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.