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Finding the Fourth Proportional to 384.78, 576.90 and 312.96

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Solution

The fourth proportional to 384.78, 576.90 and 312.96 is: 469.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.78 : 576.90 = 312.96 : x
  2. Step 2: Convert to fraction form
    384.78/576.90 = 312.96/x
  3. Step 3: Cross multiply
    384.78x = 576.90 × 312.96
  4. Step 4: Simplify right side
    384.78x = 180,546.62
  5. Step 5: Solve for x
    x = 180,546.62/384.78
  6. Step 6: Final answer
    x = 469.22

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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.