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Finding the Fourth Proportional to 617.68, 852.84 and 485.04

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Solution

The fourth proportional to 617.68, 852.84 and 485.04 is: 669.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.68 : 852.84 = 485.04 : x
  2. Step 2: Convert to fraction form
    617.68/852.84 = 485.04/x
  3. Step 3: Cross multiply
    617.68x = 852.84 × 485.04
  4. Step 4: Simplify right side
    617.68x = 413,661.51
  5. Step 5: Solve for x
    x = 413,661.51/617.68
  6. Step 6: Final answer
    x = 669.70

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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.