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Finding the Fourth Proportional to 576.21, 864.59 and 287.67

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Solution

The fourth proportional to 576.21, 864.59 and 287.67 is: 431.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.21 : 864.59 = 287.67 : x
  2. Step 2: Convert to fraction form
    576.21/864.59 = 287.67/x
  3. Step 3: Cross multiply
    576.21x = 864.59 × 287.67
  4. Step 4: Simplify right side
    576.21x = 248,715.17
  5. Step 5: Solve for x
    x = 248,715.17/576.21
  6. Step 6: Final answer
    x = 431.64

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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.