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Finding the Fourth Proportional to 385.32, 531.56 and 280.24

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Solution

The fourth proportional to 385.32, 531.56 and 280.24 is: 386.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.32 : 531.56 = 280.24 : x
  2. Step 2: Convert to fraction form
    385.32/531.56 = 280.24/x
  3. Step 3: Cross multiply
    385.32x = 531.56 × 280.24
  4. Step 4: Simplify right side
    385.32x = 148,964.37
  5. Step 5: Solve for x
    x = 148,964.37/385.32
  6. Step 6: Final answer
    x = 386.60

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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.