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Finding the Fourth Proportional to 773.21, 1,159.85 and 383.40

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Solution

The fourth proportional to 773.21, 1,159.85 and 383.40 is: 575.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.21 : 1,159.85 = 383.40 : x
  2. Step 2: Convert to fraction form
    773.21/1,159.85 = 383.40/x
  3. Step 3: Cross multiply
    773.21x = 1,159.85 × 383.40
  4. Step 4: Simplify right side
    773.21x = 444,687.45
  5. Step 5: Solve for x
    x = 444,687.45/773.21
  6. Step 6: Final answer
    x = 575.12

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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.