Home / 1,789.36-2,689.80-1,245.40

Finding the Fourth Proportional to 1,789.36, 2,689.80 and 1,245.40

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Solution

The fourth proportional to 1,789.36, 2,689.80 and 1,245.40 is: 1,872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,789.36 : 2,689.80 = 1,245.40 : x
  2. Step 2: Convert to fraction form
    1,789.36/2,689.80 = 1,245.40/x
  3. Step 3: Cross multiply
    1,789.36x = 2,689.80 × 1,245.40
  4. Step 4: Simplify right side
    1,789.36x = 3,349,876.92
  5. Step 5: Solve for x
    x = 3,349,876.92/1,789.36
  6. Step 6: Final answer
    x = 1,872.11

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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.