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Finding the Fourth Proportional to 1,858.54, 2,787.94 and 688.18

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Solution

The fourth proportional to 1,858.54, 2,787.94 and 688.18 is: 1,032.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.54 : 2,787.94 = 688.18 : x
  2. Step 2: Convert to fraction form
    1,858.54/2,787.94 = 688.18/x
  3. Step 3: Cross multiply
    1,858.54x = 2,787.94 × 688.18
  4. Step 4: Simplify right side
    1,858.54x = 1,918,604.55
  5. Step 5: Solve for x
    x = 1,918,604.55/1,858.54
  6. Step 6: Final answer
    x = 1,032.32

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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.