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Finding the Fourth Proportional to 511.44, 765.84 and 380.64

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Solution

The fourth proportional to 511.44, 765.84 and 380.64 is: 569.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.44 : 765.84 = 380.64 : x
  2. Step 2: Convert to fraction form
    511.44/765.84 = 380.64/x
  3. Step 3: Cross multiply
    511.44x = 765.84 × 380.64
  4. Step 4: Simplify right side
    511.44x = 291,509.34
  5. Step 5: Solve for x
    x = 291,509.34/511.44
  6. Step 6: Final answer
    x = 569.98

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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.