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Finding the Fourth Proportional to 5,690.78, 7,851.97 and 3,421.08

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Solution

The fourth proportional to 5,690.78, 7,851.97 and 3,421.08 is: 4,720.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,690.78 : 7,851.97 = 3,421.08 : x
  2. Step 2: Convert to fraction form
    5,690.78/7,851.97 = 3,421.08/x
  3. Step 3: Cross multiply
    5,690.78x = 7,851.97 × 3,421.08
  4. Step 4: Simplify right side
    5,690.78x = 26,862,221.80
  5. Step 5: Solve for x
    x = 26,862,221.80/5,690.78
  6. Step 6: Final answer
    x = 4,720.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.