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Finding the Fourth Proportional to 384.84, 576.30 and 281.40

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Solution

The fourth proportional to 384.84, 576.30 and 281.40 is: 421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.84 : 576.30 = 281.40 : x
  2. Step 2: Convert to fraction form
    384.84/576.30 = 281.40/x
  3. Step 3: Cross multiply
    384.84x = 576.30 × 281.40
  4. Step 4: Simplify right side
    384.84x = 162,170.82
  5. Step 5: Solve for x
    x = 162,170.82/384.84
  6. Step 6: Final answer
    x = 421.40

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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.