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Finding the Fourth Proportional to 669.85, 1,005.08 and 345.04

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Solution

The fourth proportional to 669.85, 1,005.08 and 345.04 is: 517.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.85 : 1,005.08 = 345.04 : x
  2. Step 2: Convert to fraction form
    669.85/1,005.08 = 345.04/x
  3. Step 3: Cross multiply
    669.85x = 1,005.08 × 345.04
  4. Step 4: Simplify right side
    669.85x = 346,786.05
  5. Step 5: Solve for x
    x = 346,786.05/669.85
  6. Step 6: Final answer
    x = 517.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.