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Finding the Fourth Proportional to 489.84, 676.84 and 385.76

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Solution

The fourth proportional to 489.84, 676.84 and 385.76 is: 533.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.84 : 676.84 = 385.76 : x
  2. Step 2: Convert to fraction form
    489.84/676.84 = 385.76/x
  3. Step 3: Cross multiply
    489.84x = 676.84 × 385.76
  4. Step 4: Simplify right side
    489.84x = 261,097.80
  5. Step 5: Solve for x
    x = 261,097.80/489.84
  6. Step 6: Final answer
    x = 533.03

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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.