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Finding the Fourth Proportional to 576.60, 863.55 and 287.70

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Solution

The fourth proportional to 576.60, 863.55 and 287.70 is: 430.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.60 : 863.55 = 287.70 : x
  2. Step 2: Convert to fraction form
    576.60/863.55 = 287.70/x
  3. Step 3: Cross multiply
    576.60x = 863.55 × 287.70
  4. Step 4: Simplify right side
    576.60x = 248,443.34
  5. Step 5: Solve for x
    x = 248,443.34/576.60
  6. Step 6: Final answer
    x = 430.88

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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.