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Finding the Fourth Proportional to 576.72, 865.44 and 393.12

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Solution

The fourth proportional to 576.72, 865.44 and 393.12 is: 589.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.72 : 865.44 = 393.12 : x
  2. Step 2: Convert to fraction form
    576.72/865.44 = 393.12/x
  3. Step 3: Cross multiply
    576.72x = 865.44 × 393.12
  4. Step 4: Simplify right side
    576.72x = 340,221.77
  5. Step 5: Solve for x
    x = 340,221.77/576.72
  6. Step 6: Final answer
    x = 589.93

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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.