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Finding the Fourth Proportional to 354.48, 488.12 and 280.56

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Solution

The fourth proportional to 354.48, 488.12 and 280.56 is: 386.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.48 : 488.12 = 280.56 : x
  2. Step 2: Convert to fraction form
    354.48/488.12 = 280.56/x
  3. Step 3: Cross multiply
    354.48x = 488.12 × 280.56
  4. Step 4: Simplify right side
    354.48x = 136,946.95
  5. Step 5: Solve for x
    x = 136,946.95/354.48
  6. Step 6: Final answer
    x = 386.33

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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.