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Finding the Fourth Proportional to 669.78, 1,004.67 and 207.72

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Solution

The fourth proportional to 669.78, 1,004.67 and 207.72 is: 311.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.78 : 1,004.67 = 207.72 : x
  2. Step 2: Convert to fraction form
    669.78/1,004.67 = 207.72/x
  3. Step 3: Cross multiply
    669.78x = 1,004.67 × 207.72
  4. Step 4: Simplify right side
    669.78x = 208,690.05
  5. Step 5: Solve for x
    x = 208,690.05/669.78
  6. Step 6: Final answer
    x = 311.58

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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.