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Finding the Fourth Proportional to 384.96, 531.32 and 280.20

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Solution

The fourth proportional to 384.96, 531.32 and 280.20 is: 386.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.96 : 531.32 = 280.20 : x
  2. Step 2: Convert to fraction form
    384.96/531.32 = 280.20/x
  3. Step 3: Cross multiply
    384.96x = 531.32 × 280.20
  4. Step 4: Simplify right side
    384.96x = 148,874.46
  5. Step 5: Solve for x
    x = 148,874.46/384.96
  6. Step 6: Final answer
    x = 386.73

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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.