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Finding the Fourth Proportional to 669.77, 1,005.86 and 516.07

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Solution

The fourth proportional to 669.77, 1,005.86 and 516.07 is: 775.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.77 : 1,005.86 = 516.07 : x
  2. Step 2: Convert to fraction form
    669.77/1,005.86 = 516.07/x
  3. Step 3: Cross multiply
    669.77x = 1,005.86 × 516.07
  4. Step 4: Simplify right side
    669.77x = 519,092.95
  5. Step 5: Solve for x
    x = 519,092.95/669.77
  6. Step 6: Final answer
    x = 775.04

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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.