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Finding the Fourth Proportional to 3,929.79, 5,891.04 and 1,330.91

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Solution

The fourth proportional to 3,929.79, 5,891.04 and 1,330.91 is: 1,995.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.79 : 5,891.04 = 1,330.91 : x
  2. Step 2: Convert to fraction form
    3,929.79/5,891.04 = 1,330.91/x
  3. Step 3: Cross multiply
    3,929.79x = 5,891.04 × 1,330.91
  4. Step 4: Simplify right side
    3,929.79x = 7,840,444.05
  5. Step 5: Solve for x
    x = 7,840,444.05/3,929.79
  6. Step 6: Final answer
    x = 1,995.13

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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.