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Finding the Fourth Proportional to 385.15, 575.72 and 286.73

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Solution

The fourth proportional to 385.15, 575.72 and 286.73 is: 428.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.15 : 575.72 = 286.73 : x
  2. Step 2: Convert to fraction form
    385.15/575.72 = 286.73/x
  3. Step 3: Cross multiply
    385.15x = 575.72 × 286.73
  4. Step 4: Simplify right side
    385.15x = 165,076.20
  5. Step 5: Solve for x
    x = 165,076.20/385.15
  6. Step 6: Final answer
    x = 428.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.