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Finding the Fourth Proportional to 1,858.38, 2,787.72 and 625.77

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Solution

The fourth proportional to 1,858.38, 2,787.72 and 625.77 is: 938.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.38 : 2,787.72 = 625.77 : x
  2. Step 2: Convert to fraction form
    1,858.38/2,787.72 = 625.77/x
  3. Step 3: Cross multiply
    1,858.38x = 2,787.72 × 625.77
  4. Step 4: Simplify right side
    1,858.38x = 1,744,471.54
  5. Step 5: Solve for x
    x = 1,744,471.54/1,858.38
  6. Step 6: Final answer
    x = 938.71

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1.5x scale

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.