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Finding the Fourth Proportional to 385.14, 531 and 280.14

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Solution

The fourth proportional to 385.14, 531 and 280.14 is: 386.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.14 : 531 = 280.14 : x
  2. Step 2: Convert to fraction form
    385.14/531 = 280.14/x
  3. Step 3: Cross multiply
    385.14x = 531 × 280.14
  4. Step 4: Simplify right side
    385.14x = 148,754.34
  5. Step 5: Solve for x
    x = 148,754.34/385.14
  6. Step 6: Final answer
    x = 386.24

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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.