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Finding the Fourth Proportional to 576.75, 865.00 and 280.25

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Solution

The fourth proportional to 576.75, 865.00 and 280.25 is: 420.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.75 : 865.00 = 280.25 : x
  2. Step 2: Convert to fraction form
    576.75/865.00 = 280.25/x
  3. Step 3: Cross multiply
    576.75x = 865.00 × 280.25
  4. Step 4: Simplify right side
    576.75x = 242,417.71
  5. Step 5: Solve for x
    x = 242,417.71/576.75
  6. Step 6: Final answer
    x = 420.32

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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.