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Finding the Fourth Proportional to 613.92, 920.88 and 453.12

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Solution

The fourth proportional to 613.92, 920.88 and 453.12 is: 679.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.92 : 920.88 = 453.12 : x
  2. Step 2: Convert to fraction form
    613.92/920.88 = 453.12/x
  3. Step 3: Cross multiply
    613.92x = 920.88 × 453.12
  4. Step 4: Simplify right side
    613.92x = 417,269.15
  5. Step 5: Solve for x
    x = 417,269.15/613.92
  6. Step 6: Final answer
    x = 679.68

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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.