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Finding the Fourth Proportional to 489.61, 676.11 and 445.87

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Solution

The fourth proportional to 489.61, 676.11 and 445.87 is: 615.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.61 : 676.11 = 445.87 : x
  2. Step 2: Convert to fraction form
    489.61/676.11 = 445.87/x
  3. Step 3: Cross multiply
    489.61x = 676.11 × 445.87
  4. Step 4: Simplify right side
    489.61x = 301,457.17
  5. Step 5: Solve for x
    x = 301,457.17/489.61
  6. Step 6: Final answer
    x = 615.71

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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.