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Finding the Fourth Proportional to 769.86, 1,062.90 and 475.29

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Solution

The fourth proportional to 769.86, 1,062.90 and 475.29 is: 656.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.86 : 1,062.90 = 475.29 : x
  2. Step 2: Convert to fraction form
    769.86/1,062.90 = 475.29/x
  3. Step 3: Cross multiply
    769.86x = 1,062.90 × 475.29
  4. Step 4: Simplify right side
    769.86x = 505,185.74
  5. Step 5: Solve for x
    x = 505,185.74/769.86
  6. Step 6: Final answer
    x = 656.20

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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.