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Finding the Fourth Proportional to 2,920.42, 4,380.61 and 729.14

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Solution

The fourth proportional to 2,920.42, 4,380.61 and 729.14 is: 1,093.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.42 : 4,380.61 = 729.14 : x
  2. Step 2: Convert to fraction form
    2,920.42/4,380.61 = 729.14/x
  3. Step 3: Cross multiply
    2,920.42x = 4,380.61 × 729.14
  4. Step 4: Simplify right side
    2,920.42x = 3,194,055.62
  5. Step 5: Solve for x
    x = 3,194,055.62/2,920.42
  6. Step 6: Final answer
    x = 1,093.70

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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.