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Finding the Fourth Proportional to 772.37, 1,158.85 and 285.46

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Solution

The fourth proportional to 772.37, 1,158.85 and 285.46 is: 428.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.37 : 1,158.85 = 285.46 : x
  2. Step 2: Convert to fraction form
    772.37/1,158.85 = 285.46/x
  3. Step 3: Cross multiply
    772.37x = 1,158.85 × 285.46
  4. Step 4: Simplify right side
    772.37x = 330,799.53
  5. Step 5: Solve for x
    x = 330,799.53/772.37
  6. Step 6: Final answer
    x = 428.29

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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.