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Finding the Fourth Proportional to 2,920.04, 4,379.95 and 728.79

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Solution

The fourth proportional to 2,920.04, 4,379.95 and 728.79 is: 1,093.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.04 : 4,379.95 = 728.79 : x
  2. Step 2: Convert to fraction form
    2,920.04/4,379.95 = 728.79/x
  3. Step 3: Cross multiply
    2,920.04x = 4,379.95 × 728.79
  4. Step 4: Simplify right side
    2,920.04x = 3,192,063.76
  5. Step 5: Solve for x
    x = 3,192,063.76/2,920.04
  6. Step 6: Final answer
    x = 1,093.16

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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.