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Finding the Fourth Proportional to 771.64, 1,157.88 and 511

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Solution

The fourth proportional to 771.64, 1,157.88 and 511 is: 766.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.64 : 1,157.88 = 511 : x
  2. Step 2: Convert to fraction form
    771.64/1,157.88 = 511/x
  3. Step 3: Cross multiply
    771.64x = 1,157.88 × 511
  4. Step 4: Simplify right side
    771.64x = 591,676.68
  5. Step 5: Solve for x
    x = 591,676.68/771.64
  6. Step 6: Final answer
    x = 766.78

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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.