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Finding the Fourth Proportional to 3,942.58, 5,913.80 and 981.02

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Solution

The fourth proportional to 3,942.58, 5,913.80 and 981.02 is: 1,471.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,942.58 : 5,913.80 = 981.02 : x
  2. Step 2: Convert to fraction form
    3,942.58/5,913.80 = 981.02/x
  3. Step 3: Cross multiply
    3,942.58x = 5,913.80 × 981.02
  4. Step 4: Simplify right side
    3,942.58x = 5,801,556.08
  5. Step 5: Solve for x
    x = 5,801,556.08/3,942.58
  6. Step 6: Final answer
    x = 1,471.51

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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.