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Finding the Fourth Proportional to 1,174.12, 1,620.32 and 676.78

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Solution

The fourth proportional to 1,174.12, 1,620.32 and 676.78 is: 933.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.12 : 1,620.32 = 676.78 : x
  2. Step 2: Convert to fraction form
    1,174.12/1,620.32 = 676.78/x
  3. Step 3: Cross multiply
    1,174.12x = 1,620.32 × 676.78
  4. Step 4: Simplify right side
    1,174.12x = 1,096,600.17
  5. Step 5: Solve for x
    x = 1,096,600.17/1,174.12
  6. Step 6: Final answer
    x = 933.98

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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.