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Finding the Fourth Proportional to 618.01, 852.86 and 485.40

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Solution

The fourth proportional to 618.01, 852.86 and 485.40 is: 669.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.01 : 852.86 = 485.40 : x
  2. Step 2: Convert to fraction form
    618.01/852.86 = 485.40/x
  3. Step 3: Cross multiply
    618.01x = 852.86 × 485.40
  4. Step 4: Simplify right side
    618.01x = 413,982.66
  5. Step 5: Solve for x
    x = 413,982.66/618.01
  6. Step 6: Final answer
    x = 669.87

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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.