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Finding the Fourth Proportional to 385.91, 533.13 and 356.75

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Solution

The fourth proportional to 385.91, 533.13 and 356.75 is: 492.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.91 : 533.13 = 356.75 : x
  2. Step 2: Convert to fraction form
    385.91/533.13 = 356.75/x
  3. Step 3: Cross multiply
    385.91x = 533.13 × 356.75
  4. Step 4: Simplify right side
    385.91x = 190,195.46
  5. Step 5: Solve for x
    x = 190,195.46/385.91
  6. Step 6: Final answer
    x = 492.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.