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Finding the Fourth Proportional to 385.92, 531.96 and 275.16

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Solution

The fourth proportional to 385.92, 531.96 and 275.16 is: 379.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.92 : 531.96 = 275.16 : x
  2. Step 2: Convert to fraction form
    385.92/531.96 = 275.16/x
  3. Step 3: Cross multiply
    385.92x = 531.96 × 275.16
  4. Step 4: Simplify right side
    385.92x = 146,374.11
  5. Step 5: Solve for x
    x = 146,374.11/385.92
  6. Step 6: Final answer
    x = 379.29

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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.