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Finding the Fourth Proportional to 1,858.12, 2,787.32 and 763

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Solution

The fourth proportional to 1,858.12, 2,787.32 and 763 is: 1,144.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.12 : 2,787.32 = 763 : x
  2. Step 2: Convert to fraction form
    1,858.12/2,787.32 = 763/x
  3. Step 3: Cross multiply
    1,858.12x = 2,787.32 × 763
  4. Step 4: Simplify right side
    1,858.12x = 2,126,725.16
  5. Step 5: Solve for x
    x = 2,126,725.16/1,858.12
  6. Step 6: Final answer
    x = 1,144.56

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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.