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Finding the Fourth Proportional to 5,971.40, 8,240.40 and 3,318.78

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Solution

The fourth proportional to 5,971.40, 8,240.40 and 3,318.78 is: 4,579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,971.40 : 8,240.40 = 3,318.78 : x
  2. Step 2: Convert to fraction form
    5,971.40/8,240.40 = 3,318.78/x
  3. Step 3: Cross multiply
    5,971.40x = 8,240.40 × 3,318.78
  4. Step 4: Simplify right side
    5,971.40x = 27,348,074.71
  5. Step 5: Solve for x
    x = 27,348,074.71/5,971.40
  6. Step 6: Final answer
    x = 4,579.84

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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.