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Finding the Fourth Proportional to 1,858.05, 2,785.57 and 687.31

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Solution

The fourth proportional to 1,858.05, 2,785.57 and 687.31 is: 1,030.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.05 : 2,785.57 = 687.31 : x
  2. Step 2: Convert to fraction form
    1,858.05/2,785.57 = 687.31/x
  3. Step 3: Cross multiply
    1,858.05x = 2,785.57 × 687.31
  4. Step 4: Simplify right side
    1,858.05x = 1,914,541.43
  5. Step 5: Solve for x
    x = 1,914,541.43/1,858.05
  6. Step 6: Final answer
    x = 1,030.40

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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.