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Finding the Fourth Proportional to 1,191.40, 1,787.68 and 671.96

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Solution

The fourth proportional to 1,191.40, 1,787.68 and 671.96 is: 1,008.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.40 : 1,787.68 = 671.96 : x
  2. Step 2: Convert to fraction form
    1,191.40/1,787.68 = 671.96/x
  3. Step 3: Cross multiply
    1,191.40x = 1,787.68 × 671.96
  4. Step 4: Simplify right side
    1,191.40x = 1,201,249.45
  5. Step 5: Solve for x
    x = 1,201,249.45/1,191.40
  6. Step 6: Final answer
    x = 1,008.27

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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.