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Finding the Fourth Proportional to 579.45, 869.85 and 575.40

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Solution

The fourth proportional to 579.45, 869.85 and 575.40 is: 863.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.45 : 869.85 = 575.40 : x
  2. Step 2: Convert to fraction form
    579.45/869.85 = 575.40/x
  3. Step 3: Cross multiply
    579.45x = 869.85 × 575.40
  4. Step 4: Simplify right side
    579.45x = 500,511.69
  5. Step 5: Solve for x
    x = 500,511.69/579.45
  6. Step 6: Final answer
    x = 863.77

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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.