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Finding the Fourth Proportional to 618.86, 853.95 and 382.86

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Solution

The fourth proportional to 618.86, 853.95 and 382.86 is: 528.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.86 : 853.95 = 382.86 : x
  2. Step 2: Convert to fraction form
    618.86/853.95 = 382.86/x
  3. Step 3: Cross multiply
    618.86x = 853.95 × 382.86
  4. Step 4: Simplify right side
    618.86x = 326,943.30
  5. Step 5: Solve for x
    x = 326,943.30/618.86
  6. Step 6: Final answer
    x = 528.30

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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.