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Finding the Fourth Proportional to 5,913.40, 8,879.70 and 3,321.40

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Solution

The fourth proportional to 5,913.40, 8,879.70 and 3,321.40 is: 4,987.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,913.40 : 8,879.70 = 3,321.40 : x
  2. Step 2: Convert to fraction form
    5,913.40/8,879.70 = 3,321.40/x
  3. Step 3: Cross multiply
    5,913.40x = 8,879.70 × 3,321.40
  4. Step 4: Simplify right side
    5,913.40x = 29,493,035.58
  5. Step 5: Solve for x
    x = 29,493,035.58/5,913.40
  6. Step 6: Final answer
    x = 4,987.49

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1.5x scale

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.