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Finding the Fourth Proportional to 354.20, 488.79 and 202.77

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Solution

The fourth proportional to 354.20, 488.79 and 202.77 is: 279.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.20 : 488.79 = 202.77 : x
  2. Step 2: Convert to fraction form
    354.20/488.79 = 202.77/x
  3. Step 3: Cross multiply
    354.20x = 488.79 × 202.77
  4. Step 4: Simplify right side
    354.20x = 99,111.95
  5. Step 5: Solve for x
    x = 99,111.95/354.20
  6. Step 6: Final answer
    x = 279.82

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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.