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Finding the Fourth Proportional to 1,857.29, 2,785.90 and 451.72

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Solution

The fourth proportional to 1,857.29, 2,785.90 and 451.72 is: 677.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.29 : 2,785.90 = 451.72 : x
  2. Step 2: Convert to fraction form
    1,857.29/2,785.90 = 451.72/x
  3. Step 3: Cross multiply
    1,857.29x = 2,785.90 × 451.72
  4. Step 4: Simplify right side
    1,857.29x = 1,258,434.28
  5. Step 5: Solve for x
    x = 1,258,434.28/1,857.29
  6. Step 6: Final answer
    x = 677.57

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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.