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Finding the Fourth Proportional to 5,130, 7,079.27 and 2,891.97

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Solution

The fourth proportional to 5,130, 7,079.27 and 2,891.97 is: 3,990.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,130 : 7,079.27 = 2,891.97 : x
  2. Step 2: Convert to fraction form
    5,130/7,079.27 = 2,891.97/x
  3. Step 3: Cross multiply
    5,130x = 7,079.27 × 2,891.97
  4. Step 4: Simplify right side
    5,130x = 20,473,022.00
  5. Step 5: Solve for x
    x = 20,473,022.00/5,130
  6. Step 6: Final answer
    x = 3,990.84

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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.