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Finding the Fourth Proportional to 773.08, 1,158.90 and 285.75

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Solution

The fourth proportional to 773.08, 1,158.90 and 285.75 is: 428.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.08 : 1,158.90 = 285.75 : x
  2. Step 2: Convert to fraction form
    773.08/1,158.90 = 285.75/x
  3. Step 3: Cross multiply
    773.08x = 1,158.90 × 285.75
  4. Step 4: Simplify right side
    773.08x = 331,154.60
  5. Step 5: Solve for x
    x = 331,154.60/773.08
  6. Step 6: Final answer
    x = 428.36

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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.