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Finding the Fourth Proportional to 579.63, 869.76 and 443.55

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Solution

The fourth proportional to 579.63, 869.76 and 443.55 is: 665.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.63 : 869.76 = 443.55 : x
  2. Step 2: Convert to fraction form
    579.63/869.76 = 443.55/x
  3. Step 3: Cross multiply
    579.63x = 869.76 × 443.55
  4. Step 4: Simplify right side
    579.63x = 385,782.05
  5. Step 5: Solve for x
    x = 385,782.05/579.63
  6. Step 6: Final answer
    x = 665.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.