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Finding the Fourth Proportional to 2,720.14, 4,080.81 and 988.75

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Solution

The fourth proportional to 2,720.14, 4,080.81 and 988.75 is: 1,483.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.14 : 4,080.81 = 988.75 : x
  2. Step 2: Convert to fraction form
    2,720.14/4,080.81 = 988.75/x
  3. Step 3: Cross multiply
    2,720.14x = 4,080.81 × 988.75
  4. Step 4: Simplify right side
    2,720.14x = 4,034,900.89
  5. Step 5: Solve for x
    x = 4,034,900.89/2,720.14
  6. Step 6: Final answer
    x = 1,483.34

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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.