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Finding the Fourth Proportional to 773.10, 1,158.63 and 408.15

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Solution

The fourth proportional to 773.10, 1,158.63 and 408.15 is: 611.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.10 : 1,158.63 = 408.15 : x
  2. Step 2: Convert to fraction form
    773.10/1,158.63 = 408.15/x
  3. Step 3: Cross multiply
    773.10x = 1,158.63 × 408.15
  4. Step 4: Simplify right side
    773.10x = 472,888.96
  5. Step 5: Solve for x
    x = 472,888.96/773.10
  6. Step 6: Final answer
    x = 611.68

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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.