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Finding the Fourth Proportional to 2,911.76, 4,367.51 and 720.43

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Solution

The fourth proportional to 2,911.76, 4,367.51 and 720.43 is: 1,080.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,911.76 : 4,367.51 = 720.43 : x
  2. Step 2: Convert to fraction form
    2,911.76/4,367.51 = 720.43/x
  3. Step 3: Cross multiply
    2,911.76x = 4,367.51 × 720.43
  4. Step 4: Simplify right side
    2,911.76x = 3,146,476.11
  5. Step 5: Solve for x
    x = 3,146,476.11/2,911.76
  6. Step 6: Final answer
    x = 1,080.61

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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.