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Finding the Fourth Proportional to 1,174.12, 1,757.82 and 931

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Solution

The fourth proportional to 1,174.12, 1,757.82 and 931 is: 1,393.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.12 : 1,757.82 = 931 : x
  2. Step 2: Convert to fraction form
    1,174.12/1,757.82 = 931/x
  3. Step 3: Cross multiply
    1,174.12x = 1,757.82 × 931
  4. Step 4: Simplify right side
    1,174.12x = 1,636,530.42
  5. Step 5: Solve for x
    x = 1,636,530.42/1,174.12
  6. Step 6: Final answer
    x = 1,393.84

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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.