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Finding the Fourth Proportional to 5,710.40, 7,879.20 and 3,939.20

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Solution

The fourth proportional to 5,710.40, 7,879.20 and 3,939.20 is: 5,435.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,710.40 : 7,879.20 = 3,939.20 : x
  2. Step 2: Convert to fraction form
    5,710.40/7,879.20 = 3,939.20/x
  3. Step 3: Cross multiply
    5,710.40x = 7,879.20 × 3,939.20
  4. Step 4: Simplify right side
    5,710.40x = 31,037,744.64
  5. Step 5: Solve for x
    x = 31,037,744.64/5,710.40
  6. Step 6: Final answer
    x = 5,435.30

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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.