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Finding the Fourth Proportional to 5,781.37, 7,978.29 and 3,390.85

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Solution

The fourth proportional to 5,781.37, 7,978.29 and 3,390.85 is: 4,679.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,781.37 : 7,978.29 = 3,390.85 : x
  2. Step 2: Convert to fraction form
    5,781.37/7,978.29 = 3,390.85/x
  3. Step 3: Cross multiply
    5,781.37x = 7,978.29 × 3,390.85
  4. Step 4: Simplify right side
    5,781.37x = 27,053,184.65
  5. Step 5: Solve for x
    x = 27,053,184.65/5,781.37
  6. Step 6: Final answer
    x = 4,679.37

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1.5x scale

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.