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Finding the Fourth Proportional to 771.34, 1,155.71 and 380.82

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Solution

The fourth proportional to 771.34, 1,155.71 and 380.82 is: 570.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.34 : 1,155.71 = 380.82 : x
  2. Step 2: Convert to fraction form
    771.34/1,155.71 = 380.82/x
  3. Step 3: Cross multiply
    771.34x = 1,155.71 × 380.82
  4. Step 4: Simplify right side
    771.34x = 440,117.48
  5. Step 5: Solve for x
    x = 440,117.48/771.34
  6. Step 6: Final answer
    x = 570.59

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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.