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Finding the Fourth Proportional to 618.18, 851.72 and 486.96

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Solution

The fourth proportional to 618.18, 851.72 and 486.96 is: 670.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.18 : 851.72 = 486.96 : x
  2. Step 2: Convert to fraction form
    618.18/851.72 = 486.96/x
  3. Step 3: Cross multiply
    618.18x = 851.72 × 486.96
  4. Step 4: Simplify right side
    618.18x = 414,753.57
  5. Step 5: Solve for x
    x = 414,753.57/618.18
  6. Step 6: Final answer
    x = 670.93

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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.