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Finding the Fourth Proportional to 5,710.90, 7,879.89 and 3,939.70

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Solution

The fourth proportional to 5,710.90, 7,879.89 and 3,939.70 is: 5,435.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,710.90 : 7,879.89 = 3,939.70 : x
  2. Step 2: Convert to fraction form
    5,710.90/7,879.89 = 3,939.70/x
  3. Step 3: Cross multiply
    5,710.90x = 7,879.89 × 3,939.70
  4. Step 4: Simplify right side
    5,710.90x = 31,044,402.63
  5. Step 5: Solve for x
    x = 31,044,402.63/5,710.90
  6. Step 6: Final answer
    x = 5,435.99

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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.