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Finding the Fourth Proportional to 857.14, 1,187.82 and 840.74

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Solution

The fourth proportional to 857.14, 1,187.82 and 840.74 is: 1,165.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.14 : 1,187.82 = 840.74 : x
  2. Step 2: Convert to fraction form
    857.14/1,187.82 = 840.74/x
  3. Step 3: Cross multiply
    857.14x = 1,187.82 × 840.74
  4. Step 4: Simplify right side
    857.14x = 998,641.85
  5. Step 5: Solve for x
    x = 998,641.85/857.14
  6. Step 6: Final answer
    x = 1,165.09

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.