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Finding the Fourth Proportional to 1,821.51, 2,730.35 and 725.43

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Solution

The fourth proportional to 1,821.51, 2,730.35 and 725.43 is: 1,087.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.51 : 2,730.35 = 725.43 : x
  2. Step 2: Convert to fraction form
    1,821.51/2,730.35 = 725.43/x
  3. Step 3: Cross multiply
    1,821.51x = 2,730.35 × 725.43
  4. Step 4: Simplify right side
    1,821.51x = 1,980,674.17
  5. Step 5: Solve for x
    x = 1,980,674.17/1,821.51
  6. Step 6: Final answer
    x = 1,087.38

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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.