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Finding the Fourth Proportional to 511.86, 765.14 and 380.64

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Solution

The fourth proportional to 511.86, 765.14 and 380.64 is: 568.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.86 : 765.14 = 380.64 : x
  2. Step 2: Convert to fraction form
    511.86/765.14 = 380.64/x
  3. Step 3: Cross multiply
    511.86x = 765.14 × 380.64
  4. Step 4: Simplify right side
    511.86x = 291,242.89
  5. Step 5: Solve for x
    x = 291,242.89/511.86
  6. Step 6: Final answer
    x = 568.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.