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Finding the Fourth Proportional to 2,790.71, 3,851.22 and 1,531.88

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Solution

The fourth proportional to 2,790.71, 3,851.22 and 1,531.88 is: 2,114.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,790.71 : 3,851.22 = 1,531.88 : x
  2. Step 2: Convert to fraction form
    2,790.71/3,851.22 = 1,531.88/x
  3. Step 3: Cross multiply
    2,790.71x = 3,851.22 × 1,531.88
  4. Step 4: Simplify right side
    2,790.71x = 5,899,587.64
  5. Step 5: Solve for x
    x = 5,899,587.64/2,790.71
  6. Step 6: Final answer
    x = 2,114.01

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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.