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Finding the Fourth Proportional to 485, 669.38 and 277.96

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Solution

The fourth proportional to 485, 669.38 and 277.96 is: 383.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    485 : 669.38 = 277.96 : x
  2. Step 2: Convert to fraction form
    485/669.38 = 277.96/x
  3. Step 3: Cross multiply
    485x = 669.38 × 277.96
  4. Step 4: Simplify right side
    485x = 186,060.86
  5. Step 5: Solve for x
    x = 186,060.86/485
  6. Step 6: Final answer
    x = 383.63

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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.