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Finding the Fourth Proportional to 1,787.84, 2,679.29 and 1,290.28

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Solution

The fourth proportional to 1,787.84, 2,679.29 and 1,290.28 is: 1,933.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.84 : 2,679.29 = 1,290.28 : x
  2. Step 2: Convert to fraction form
    1,787.84/2,679.29 = 1,290.28/x
  3. Step 3: Cross multiply
    1,787.84x = 2,679.29 × 1,290.28
  4. Step 4: Simplify right side
    1,787.84x = 3,457,026.05
  5. Step 5: Solve for x
    x = 3,457,026.05/1,787.84
  6. Step 6: Final answer
    x = 1,933.64

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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.