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Finding the Fourth Proportional to 384.28, 576.54 and 140.76

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Solution

The fourth proportional to 384.28, 576.54 and 140.76 is: 211.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.28 : 576.54 = 140.76 : x
  2. Step 2: Convert to fraction form
    384.28/576.54 = 140.76/x
  3. Step 3: Cross multiply
    384.28x = 576.54 × 140.76
  4. Step 4: Simplify right side
    384.28x = 81,153.77
  5. Step 5: Solve for x
    x = 81,153.77/384.28
  6. Step 6: Final answer
    x = 211.18

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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.