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Finding the Fourth Proportional to 5,281.68, 7,921.16 and 1,993.80

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Solution

The fourth proportional to 5,281.68, 7,921.16 and 1,993.80 is: 2,990.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,281.68 : 7,921.16 = 1,993.80 : x
  2. Step 2: Convert to fraction form
    5,281.68/7,921.16 = 1,993.80/x
  3. Step 3: Cross multiply
    5,281.68x = 7,921.16 × 1,993.80
  4. Step 4: Simplify right side
    5,281.68x = 15,793,208.81
  5. Step 5: Solve for x
    x = 15,793,208.81/5,281.68
  6. Step 6: Final answer
    x = 2,990.19

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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.