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Finding the Fourth Proportional to 489.95, 676.38 and 342.84

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Solution

The fourth proportional to 489.95, 676.38 and 342.84 is: 473.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.95 : 676.38 = 342.84 : x
  2. Step 2: Convert to fraction form
    489.95/676.38 = 342.84/x
  3. Step 3: Cross multiply
    489.95x = 676.38 × 342.84
  4. Step 4: Simplify right side
    489.95x = 231,890.12
  5. Step 5: Solve for x
    x = 231,890.12/489.95
  6. Step 6: Final answer
    x = 473.30

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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.