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Finding the Fourth Proportional to 385.40, 531.08 and 274.56

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Solution

The fourth proportional to 385.40, 531.08 and 274.56 is: 378.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.40 : 531.08 = 274.56 : x
  2. Step 2: Convert to fraction form
    385.40/531.08 = 274.56/x
  3. Step 3: Cross multiply
    385.40x = 531.08 × 274.56
  4. Step 4: Simplify right side
    385.40x = 145,813.32
  5. Step 5: Solve for x
    x = 145,813.32/385.40
  6. Step 6: Final answer
    x = 378.34

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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.