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Finding the Fourth Proportional to 1,963, 2,689.34 and 1,889.20

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Solution

The fourth proportional to 1,963, 2,689.34 and 1,889.20 is: 2,588.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,963 : 2,689.34 = 1,889.20 : x
  2. Step 2: Convert to fraction form
    1,963/2,689.34 = 1,889.20/x
  3. Step 3: Cross multiply
    1,963x = 2,689.34 × 1,889.20
  4. Step 4: Simplify right side
    1,963x = 5,080,701.13
  5. Step 5: Solve for x
    x = 5,080,701.13/1,963
  6. Step 6: Final answer
    x = 2,588.23

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.