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Finding the Fourth Proportional to 669.80, 1,004.85 and 207.62

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Solution

The fourth proportional to 669.80, 1,004.85 and 207.62 is: 311.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.80 : 1,004.85 = 207.62 : x
  2. Step 2: Convert to fraction form
    669.80/1,004.85 = 207.62/x
  3. Step 3: Cross multiply
    669.80x = 1,004.85 × 207.62
  4. Step 4: Simplify right side
    669.80x = 208,621.93
  5. Step 5: Solve for x
    x = 208,621.93/669.80
  6. Step 6: Final answer
    x = 311.47

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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.