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Finding the Fourth Proportional to 769.92, 1,062.60 and 455.46

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Solution

The fourth proportional to 769.92, 1,062.60 and 455.46 is: 628.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.92 : 1,062.60 = 455.46 : x
  2. Step 2: Convert to fraction form
    769.92/1,062.60 = 455.46/x
  3. Step 3: Cross multiply
    769.92x = 1,062.60 × 455.46
  4. Step 4: Simplify right side
    769.92x = 483,971.80
  5. Step 5: Solve for x
    x = 483,971.80/769.92
  6. Step 6: Final answer
    x = 628.60

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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.