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Finding the Fourth Proportional to 771.64, 1,157.68 and 381.76

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Solution

The fourth proportional to 771.64, 1,157.68 and 381.76 is: 572.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.64 : 1,157.68 = 381.76 : x
  2. Step 2: Convert to fraction form
    771.64/1,157.68 = 381.76/x
  3. Step 3: Cross multiply
    771.64x = 1,157.68 × 381.76
  4. Step 4: Simplify right side
    771.64x = 441,955.92
  5. Step 5: Solve for x
    x = 441,955.92/771.64
  6. Step 6: Final answer
    x = 572.75

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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.