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Finding the Fourth Proportional to 617.12, 851.54 and 355.04

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Solution

The fourth proportional to 617.12, 851.54 and 355.04 is: 489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.12 : 851.54 = 355.04 : x
  2. Step 2: Convert to fraction form
    617.12/851.54 = 355.04/x
  3. Step 3: Cross multiply
    617.12x = 851.54 × 355.04
  4. Step 4: Simplify right side
    617.12x = 302,330.76
  5. Step 5: Solve for x
    x = 302,330.76/617.12
  6. Step 6: Final answer
    x = 489.91

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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.