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Finding the Fourth Proportional to 618.57, 853.54 and 385.70

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Solution

The fourth proportional to 618.57, 853.54 and 385.70 is: 532.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.57 : 853.54 = 385.70 : x
  2. Step 2: Convert to fraction form
    618.57/853.54 = 385.70/x
  3. Step 3: Cross multiply
    618.57x = 853.54 × 385.70
  4. Step 4: Simplify right side
    618.57x = 329,205.15
  5. Step 5: Solve for x
    x = 329,205.15/618.57
  6. Step 6: Final answer
    x = 532.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.