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Finding the Fourth Proportional to 1,857.58, 2,787.79 and 688.69

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Solution

The fourth proportional to 1,857.58, 2,787.79 and 688.69 is: 1,033.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.58 : 2,787.79 = 688.69 : x
  2. Step 2: Convert to fraction form
    1,857.58/2,787.79 = 688.69/x
  3. Step 3: Cross multiply
    1,857.58x = 2,787.79 × 688.69
  4. Step 4: Simplify right side
    1,857.58x = 1,919,923.10
  5. Step 5: Solve for x
    x = 1,919,923.10/1,857.58
  6. Step 6: Final answer
    x = 1,033.56

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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.