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Finding the Fourth Proportional to 979.92, 1,466.88 and 613.44

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Solution

The fourth proportional to 979.92, 1,466.88 and 613.44 is: 918.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.92 : 1,466.88 = 613.44 : x
  2. Step 2: Convert to fraction form
    979.92/1,466.88 = 613.44/x
  3. Step 3: Cross multiply
    979.92x = 1,466.88 × 613.44
  4. Step 4: Simplify right side
    979.92x = 899,842.87
  5. Step 5: Solve for x
    x = 899,842.87/979.92
  6. Step 6: Final answer
    x = 918.28

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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.