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Finding the Fourth Proportional to 1,265.82, 1,898.61 and 857.58

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Solution

The fourth proportional to 1,265.82, 1,898.61 and 857.58 is: 1,286.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.82 : 1,898.61 = 857.58 : x
  2. Step 2: Convert to fraction form
    1,265.82/1,898.61 = 857.58/x
  3. Step 3: Cross multiply
    1,265.82x = 1,898.61 × 857.58
  4. Step 4: Simplify right side
    1,265.82x = 1,628,209.96
  5. Step 5: Solve for x
    x = 1,628,209.96/1,265.82
  6. Step 6: Final answer
    x = 1,286.29

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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.