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Finding the Fourth Proportional to 1,297.10, 1,789.35 and 854.84

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Solution

The fourth proportional to 1,297.10, 1,789.35 and 854.84 is: 1,179.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.10 : 1,789.35 = 854.84 : x
  2. Step 2: Convert to fraction form
    1,297.10/1,789.35 = 854.84/x
  3. Step 3: Cross multiply
    1,297.10x = 1,789.35 × 854.84
  4. Step 4: Simplify right side
    1,297.10x = 1,529,607.95
  5. Step 5: Solve for x
    x = 1,529,607.95/1,297.10
  6. Step 6: Final answer
    x = 1,179.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.