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Finding the Fourth Proportional to 1,809.72, 2,712.30 and 986.28

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Solution

The fourth proportional to 1,809.72, 2,712.30 and 986.28 is: 1,478.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809.72 : 2,712.30 = 986.28 : x
  2. Step 2: Convert to fraction form
    1,809.72/2,712.30 = 986.28/x
  3. Step 3: Cross multiply
    1,809.72x = 2,712.30 × 986.28
  4. Step 4: Simplify right side
    1,809.72x = 2,675,087.24
  5. Step 5: Solve for x
    x = 2,675,087.24/1,809.72
  6. Step 6: Final answer
    x = 1,478.18

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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.