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Finding the Fourth Proportional to 769.93, 1,062.60 and 455.47

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Solution

The fourth proportional to 769.93, 1,062.60 and 455.47 is: 628.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.93 : 1,062.60 = 455.47 : x
  2. Step 2: Convert to fraction form
    769.93/1,062.60 = 455.47/x
  3. Step 3: Cross multiply
    769.93x = 1,062.60 × 455.47
  4. Step 4: Simplify right side
    769.93x = 483,982.42
  5. Step 5: Solve for x
    x = 483,982.42/769.93
  6. Step 6: Final answer
    x = 628.61

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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.