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Finding the Fourth Proportional to 5,318.76, 7,975.44 and 3,990.36

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Solution

The fourth proportional to 5,318.76, 7,975.44 and 3,990.36 is: 5,983.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318.76 : 7,975.44 = 3,990.36 : x
  2. Step 2: Convert to fraction form
    5,318.76/7,975.44 = 3,990.36/x
  3. Step 3: Cross multiply
    5,318.76x = 7,975.44 × 3,990.36
  4. Step 4: Simplify right side
    5,318.76x = 31,824,876.76
  5. Step 5: Solve for x
    x = 31,824,876.76/5,318.76
  6. Step 6: Final answer
    x = 5,983.51

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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.