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Finding the Fourth Proportional to 1,787.28, 2,680.08 and 690.84

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Solution

The fourth proportional to 1,787.28, 2,680.08 and 690.84 is: 1,035.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.28 : 2,680.08 = 690.84 : x
  2. Step 2: Convert to fraction form
    1,787.28/2,680.08 = 690.84/x
  3. Step 3: Cross multiply
    1,787.28x = 2,680.08 × 690.84
  4. Step 4: Simplify right side
    1,787.28x = 1,851,506.47
  5. Step 5: Solve for x
    x = 1,851,506.47/1,787.28
  6. Step 6: Final answer
    x = 1,035.94

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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.